... A reference guide on refractive surgery was published in September of 1998 ... CK], Intacs , phakic IOLs, and presbyopia surgeries) and technology ...
DTIC Science & Technology
... Descriptors : *VISION, *REFRACTION, *SURGERY, *OPHTHALMOLOGY, PILOTS, COMMERCIAL AVIATION, CIVIL AVIATION, EYE, PATHOLOGY ...
... of laser refractive surgery do not require the creation of a corneal flap. These include photorefractive keratectomy ( ...
MedlinePLUS
The equations for refraction of either the extraordinary wave of light or the wavefunction of an electron at a planar boundary between two misoriented uniaxially anisotropic materials are shown via raytracing to yield a transverse displacement of the object point. The displacement is independent of ray incidence angle and is thus free from spherical aberration, yielding a ...
Energy Citations Database
... laser refractive eye surgery in military aircrew Patricia Hinton ... A longitudinal study on the effects of laser refractive eye surgery in military aircrew ...
... Abstract : Refractive surgery to visually rehabilitate refractive errors of the eye continues to evolve at a significant pace and is here to stay. ...
Categories Four categories of refractive surgery include: Excimer laser procedures Implant procedures Thermal procedures Other refractice procedures Excimer Laser Procedures LASIK (Laser In Situ Keratomileusis) LASIK combines ...
... Accession Number : ADA436518. Title : Outcome Analysis Tool for Army Refractive Surgery Program. Descriptive Note : Final rept. ...
The goal of refractive surgery is to sculpt the corneal surface by changing its ... LASIK are three methods for performing corneal refractive surgery. ...
NASA Website
... of the Federal Food, Drug, and Cosmetic Act (the Act ... 2 Phacoemulsification and corneal refractive surgery are two distinct and separate ocular surgeries. ...
Center for Drug Evaluation (CDER)
pediatric vision screening through telemedicine, screening for keratoconus prior to refractive laser surgery
E-print Network
... a history of autoimmune diseases; are pregnant or nursing; have a history of eye disease or previous ...
This book contains 12 chapters. Some of the titles are: Perspectives on refractive surgery; Radial keratotomy; The refractive aspects of corneal transplantation; Wedge resection and relating incisions; Laser surgery of the cornea; and All plastic corneal lenses.
Purpose: Subjects after cataract removal and intra-ocular lens (IOL) implantation lose their accommodation capability and are left with a monofocal visual system. The IOL refraction and the precision of the surgery determine the focal distance and amount of astigmatic aberrations. We present a design, simulations and experimental bench testing of a novel, ...
NASA Astrophysics Data System (ADS)
Uniformity of illumination of spherical laser fusion targets is calculated for eight, twelve, and twenty beams arranged according to the symmetry of the Platonic solids. Uniformity is optimized by varying the f/no. of ideal aberration-free lenses, amount of beam overlap, and the shape of the spatial beam profile. The numerical results show twenty-beam illumination to be ...
... Eye-ball rebuilding using splines with a view to refractive surgery simulation ... organ edge reconstruction of varied forms as bones, heart, brain, etc.. ...
... Contact lenses, and more recently refractive surgery, reduce the number of aircrew that must rely on spectacles when flying; however, spectacle ...
... Abstract : Refractive surgery corrects lower-order refractive aberrations (sphere and astigmatism), but in many cases it inadvertently creates large ...
IR optical systems such as Petzval doublet refractive lenses or Cassegrain reflective mirrors are either expensive or poor in image quality. Taking advantage of the low cost of reflective mirrors, here we present an optical design of Double Cassegrain reflective mirrors consisting of two sets of Cassegrain reflectors facing each other symmetrically. This symmetry also cancels ...
Over the last decade excimer lasers have been broadly used for technological and medical processes. One of the most widespread applications of excimer laser is the clinical use for refractive surgery. Refractive surgery with excimer lasers is the prevalent method for the eye acuity correction. Operation at 193 ...
A reply to the comment by Jim�nez et al. directed to the paper of �Experiments on PMMA model to predict the impact of corneal refractive surgery on corneal shape� by Dorronsoro et al., Opt. Express, 14, 6142-6156 (2006).
Civil airmen with refractive surgery may obtain any class of Federal Aviation Administration (FAA) medical certificate provided they meet the applicable vision standards, and an eye specialist verifies that healing is complete, visual acuity is stable, an...
National Technical Information Service (NTIS)
Sep 18, 2007 ... The high power laser can be applied to ophthalmology, refractive surgery, photocoagulation, general surgery, therapeutic, imaging, ...
Sep 18, 2009 ... The high power amplifier/laser can be applied to ophthalmology, refractive surgery, photocoagulation, general surgery, therapeutic, imaging, ...
Sep 8, 2006 ... The high power laser can be applied to ophthalmology, refractive surgery, photocoagulation, general surgery, therapeutic, imaging, ...
Aug 2, 2007 ... The high power laser can be applied to ophthalmology, refractive surgery, photocoagulation, general surgery, therapeutic, imaging, ...
Selection of the appropriate refractive procedure is made by the surgeon according to medical criteria. However, some professions in the Federal Republic of Germany require certain eyesight standards and only permit the performance of certain refractive procedures. Therefore it is crucial for the surgeon to know whether a chosen ...
PubMed
Refractive surgery in patients with accommodative and non-accommodative strabismus: 1-year prospective follow-up
pair of contact lenses for treatment of keratoconus or postcataract surgery). 17. Routine refraction
pair of contact lenses for treatment of keratoconus or postcataract surgery). 18. Routine refraction
... or contact lenses are the primary treatment for myopia ... There were also problems with epithelial thinning, recurrent corneal erosions, iritis ...
... only relevant for nanosurgery with tightly focused laser pulses but also for applications such as intrastromal corneal refractive surgery or presbyopia ...
The effect of microgravity on the cornea of refractive surgery subjects is also unknown. Physiologic changes such as a rise in intraocular pressure and ...
... The purpose of this study was to evaluate visual performance after refractive surgery, how the cornea changes in terms of clarity and shape, and ...
Excellent high contrast visual acuity results are achieved after laser refractive eye surgery for low to moderate refractive errors. In the early 1990's, many reports showed a decrease in low contrast acuity after laser surgery. Military aircrew work in m...
The contributors to this text combine their expertise to make this book available on intraocular lenses, refractive corneal surgery, and the use of the YAG laser. Included is information on; IOL power calculations; the use of the YAG laser; retinal damage by short wavelength light; reviews of corneal refractive ...
To determine and analyze the reasons for patients not undergoing laser corneal refractive surgery. A retrospective observational study was conducted to analyze the reasons for not undergoing laser corneal refractive surgery in 611 patients. In this study, 611 (14.34%) among 4,262 enrolled patients did not undergo ...
Cataract surgery after corneal refractive surgery can be challenging for the ocular surgeon due to the difficulty with accurate intraocular lens (IOL) power determination and unexpected refractive surprises. As clinicians have done more work, a number of error sources have been determined. Furthermore, an ...
PubMed Central
Medical Devices Home > Medical Devices > Products and Medical Procedures > Surgery and Life Support Devices Section Contents Menu Products and Medical Procedures Surgery and Life Support ...
Laser writing of longitudinal waveguides in bulk transparent materials degrades with the focusing depth due to wavefront distortions generated at the air-dielectric interface. Using adaptive spatial tailoring of ultrashort laser pulses, we show that spherical aberrations can be dynamically compensated in optical glasses, in synchronization with the writing procedure. ...
Conventional optical imaging systems suffer from the presence of many imperfections, such as spherical aberrations, astigmatism, or coma. If the imaging system is corrected for spherical aberrations and fulfills the Abbe sine condition, perfect imaging is guaranteed between two parallel planes but only in a small neighborhood of the optical axis. It is therefore worth asking for optical systems ...
Spectacles have become a problem of life-style in some societies. In the USA, in 1999 approximately 1 million LASIK operations have been performed to correct myopia and astigmatism and in Europe the frequency of refractive surgery stead by increases. However, only 3 to 5% of these operations are medically indicated. Refractive ...
The aim of this paper was presentation of current opinions about intraocular refractive surgery. The implantation of Baikoff and Worst-Fechner lenses to anterior chamber and usage of refractive PC IOL is described. The extraction of clear lens in high ametropia and implantation of PC IOLs of adequate power was also presented. The paper ...
The 193 nm argon fluoride (ArF) excimer laser can effectively be used to change the radius of curvature of the cornea and thus alter the refractive state of the eye. This change allows myopic (nearsighted) patients to see well with less dependence on glasses or contact lenses. The two major techniques of laser refractive surgery ...
is often higher than normal in keratoconus, penetrating keratoplasty, de-centered myopic refractive measure of corneal varifocality. High values of CVP are found in moderate to severe keratoconus corneas
The Eye, Hartmann, Shack, and Scheiner Klaus Biedermann The Royal Institute of Technology of the paper are prohibited. 7 #12;7 The Eye, Hartmann, Shack, and Scheiner Klaus Biedermann The Royal Institute of refraction of human eyes, similar to the one used today in the Hartmann-Shack sensor. Refractive surgery
Refractive surgical procedures performed in the United States have increased in recent years and continued growth is projected. Postoperative side effects can affect the quality of vision and may be unacceptable in a cockpit environment. The scientific li...
Refractive surgery corrects lower-order refractive aberrations (sphere and astigmatism), but in many cases it inadvertently creates large higher-order aberrations that can degrade vision. This has prompted the development of new instruments, aberrometers,...
Flat and spherical PMMA surfaces were ablated with a standard refractive surgery laser system. The ratio of profiles on flat to spherical PMMA surfaces was used to estimate experimentally the radial change in ablation efficiency for PMMA and cornea. Changes in ablation efficiency accounted for most of the asphericity increase found clinically, using the ...
Classification of LASIK in refractive surgery and treatment by health insurance, and education by the physician. Results in clinical studies and case law in Germany 2010. PMID:21850608
LASIK; Dynamic light scattering; Photo refractive surgery; Photon correlation spectroscopy; Cornea NUMBER OF PAGES: 16. PDF AVAILABLE FROM URL: ...
... Accession Number : ADA428733. Title : The Aviation Accident Experience of Civilian Airmen With Refractive Surgery. Descriptive Note : Final rept. ...
... efforts to develop a disability glare tester that could be used for predicting night vision problems resulting from post refractive surgery, particularly for ...
Apr 21, 2011 ... Experiment: + Effect of Microgravity on the Cornea of a Refractive Surgery Subject (Visual_Acuity) Experiment Performed On: + Expedition 18 ...
... Servers have been ordered for: "* Womack Army Medical Center, Ft. Bragg, NC. "* Landstuhl Regional Medical Center, Germany. 4 Page 5. ...
... Abstract : The Surgeon General has recently authorized individuals who have had corneal refractive surgery entry, by waiver, into the services. ...
Jul 28, 2011 ... "The technology also provides more accurate eye measurements for people about to undergo Laser Refractive Surgery," Neal said. ...
Apr 21, 2011 ... + Effect of Microgravity on the Cornea of a Refractive Surgery Subject ( Visual_Acuity) Experiment Performed On: + Expedition 18 ...
Apr 21, 2011 ... + Effect of Microgravity on the Cornea of a Refractive Surgery Subject ( Visual_Acuity) Skip to page content Hardware ...
... Password Forgot your password? 17 - 21 September (Vienna, Austria) ESCRS Congress ISRS Symposium 21 - 22 October (Orlando, ...
... anomalies can be accomplished in most aircrew by use of spectacles, contact lenses, and/or, recently approved corneal refractive surgery (CRS). ...
... dry air. Shield Your Eyes From Allergies When pollen counts are high, sunglasses or eyeglasses can help prevent pollen from getting in your eyes. Know Your Eye ...
... Descriptors : *FLIGHT CREWS, *VISION, *LASER SURGERY, MILITARY PERSONNEL, CANADA, EYE, LOW LIGHT LEVELS, GLARE, VISUAL ...
System, in audio/video Proc. Cataract and Refractive Surgery: Current Issues ... Biomedical Optoelectronics in Clinical Chemistry and Bio-technology, SPIE, ...
Tear film maintain ocular surface health and functional through nutritional support, anti-bacterial properties, viscoelastic protection, smooth optical surface and increase of lubrication. The ocular surface may be affected after surgery (cataract, glaucoma, refractive surgery) or chronic glaucoma treatment. PMID:21774385
can I swim? When will I be able to drive? Work? Exercise? Are there any activities or sports that I will not be able to do after my eyes are healed? Will the surgery cause...
Science.gov Websites
. The variety of conditions covered by optometrists includes eye injuries and diseases such as glaucoma%, for example, help manage patients who have had refractive (laser) eye surgery. Although most optometrists surgery as well as diagnose and treat eye diseases and injuries. How do I become an Optometrist? To become
The non-steroidal anti-inflammatory drug (NSAID) ketorolac tromethamine 0.4% ophthalmic solution, a recent reformulation containing 20% less active ingredient that the original formulation, is indicated for the reduction of ocular pain and burning/stinging following corneal refractive surgery. Clinical studies have shown ketorolac tromethamine 0.4% to be ...
Purpose:? To provide a theoretical approach for combining refractive and topographic data in the planning of corneal laser refractive surgery for astigmatism. Methods:? Refractive and topographic data for astigmatism were transformed to the corneal plane. Net astigmatisms were converted to polar values. An ...
Studies on corneal surgery and flap processing on enucleated porcine eyes have been performed using a dedicated femtosecond laser source based on Ytterbium technology. The influence of several laser parameters such as wavelength, energy, repetition rate and numerical aperture has been studied. Best parameters for ocular femtosecond laser surgery are ...
A novel aberration-free pulse stretcher design is presented. This system permits the stretching of a 30-fs pulse to 300 ps and recompression to a duration of 33 fs, limited by the spectral clipping. {copyright} {ital 1996 Optical Society of America.}
While corneal refractive surgery offers the potential to reduce dependence on optical appliances and widen the potential candidate pool, residual optical effects from such elective surgery can impact quality of vision and visual performance not identified...
symmetric shapes simulating myopic refractive surgery keratoconus and hyperopic refractive surgery. Each lies on the symmetry axis. The specifications of latter two shapes are given by: Name keratoconus.04 mm 8.04 (fix center) 8.04 (float center) Placido image of keratoconus shape Placido image
In ophthalmology, the laser excimer corneal surface ablation used to correct the refractive eye defects, such as myopia, astigmatism and hyperopia and, more recently, presbyopia is known as refractive surgery. Typically, the characterization of the corresponding technique, as well as the laser accuracy, is performed by analyzing ...
The endothelium is vital to the health and optical clarity of the human cornea. The safety of procedures to correct refractive errors depends on preservation of an intact corneal endothelium. Disease states and genetic and environmental factors affect the corneal endothelium; an unstable corneal endothelium can impact the success of refractive ...
We calculate whether deviations of Lambert-Beer�s law, which regulates depth ablation during corneal ablation, significantly influence corneal refractive parameters after refractive surgery and whether they influence visual performance. For this, we compute a point-to-point correction on the cornea while assuming a non-linear ...
Analysis of induced wavefront aberration after refractive surgery is important in the design of vision correction and the development of visual correction technology. Based on a mathematical model of the anterior corneal surface, the influence of treatment decentration on induced wavefront aberrations was studied by considering oblique incidence. The ...
A finite element method was used to study the biomechanical behavior of the cornea and its response to refractive surgery when stiffness inhomogeneities varying with depth are considered. Side-by-side comparisons of different constitutive laws that have been commonly used to model refractive surgery were also ...
The Commission of Refractive Surgery (KRC), which is a combined commission of the German Ophthalmological Society (DOG) and the Professional Association of German Ophthalmologists (BVA), has made an up-to-date evaluation of the operative techniques for correction of refraction errors. In the revised guidelines drawn up by the KRC for ...
To ensure vision readiness on the battlefield, the French military has been providing its soldiers with eyewear since World War I. A military refractive surgery program was initiated in 2008. A prospective questionnaire-based investigation on optical correction and quality of vision among active duty members with visual deficiencies stationed in Djibouti, ...
We provide an adjustment factor for ablation algorithms used in photorefractive laser surgery that takes into account how laser polarization in reflection losses affects the cornea. We evaluate the influence of this factor on corneal radius and asphericity after surgery, showing that it is significant for visual performance (effective visual acuity is ...
Recently, two papers �Dorronsoro et al., Experiment on PMMA models to predict the impact of corneal refractive surgery on corneal shape, Opt. Express 14, 6142 (2006)� and �JR Jim�nez et al., Deviations of Lambert-Beer�s law affect corneal refractive parameters after refractive ...
The design and testing of an ocular Shack-Hartmann aberrometer is presented. The aberrometer objectively measures optical aberrations in the human eye in vivo. The sensor was successfully tested for measurements of refractive error (sphere and cylinder) and spherical aberration. Vignetting limits the measurement range of the wavefront to a range of -10 D to +15 D. Large ...
The aim of this article is to provide information and an overview of the potential risks and benefits of excimer laser surgery, a new and promising technique in ophthalmic surgery. Although this review concentrates on the use of the laser for refractive purposes, novel therapeutic techniques are also discussed. It is hoped that this ...
The aim of this research is to study the properties of the transverse chromatic aberration (TCA) after the LASIK refractive surgery based on the individual eye model involving the angle between visual axis and optical axis. According to the measurements of the corneal surfaces, the optical axis lengths and the wavefront aberrations, the individual eye ...
s anatomical consequences cannot be reversed. Only nonsurgical refractive devices, such as spectacles and contact lenses, can truly be considered reversible. IS REMOVABILITY IMPORTANT? In nearly all of the 34 eyes, the reason for ring removal was dissatisfaction of the patient. The overall percentage of removal was nearly 5% in both phase II and phase III of the US FDA trial ...
Excimer laser photorefractive keratectomy and excimer laser in situ keratomileusis are relatively new treatment modalities that can be used to correct refractive errors of the eye. They are most commonly used to correct myopia (nearsightedness) but can also be used to correct hyperopia (farsightedness) and astigmatism. The excimer laser alters the ...
An expression has been deduced theoretically from a schematic-eye model, for the transverse or lateral chromatic aberration (TCA) after refractive surgery. The aim was to investigate analytically how chromatic aberration varies after the emmetropization process. These changes in the TCA have been characterized from changes in corneal asphericity. The ...
BACKGROUND: We report the results of a recent technique of keratomileusis for myopia: excimer laser in-situ keratomileusis (LASIK). METHODS: We studied retrospectively 88 eyes of 63 patients that received LASIK with the Chiron Automated Corneal Shaper and the Summit OmniMed excimer laser under a hinged corneal flap without sutures. RESULTS: Mean follow-up was 5.2 months. Mean spherical equivalent ...
PURPOSE:To assess the clinical outcomes of photoastigmatic refractive keratectomy (PARK) for the correction of residual refractive errors after cataract surgery. METHODS:This study evaluated 88 eyes of 66 consecutive patients with mean spherical equivalent refraction of -3.16�1.71 diopters (D) who underwent PARK ...
Ortho-K was indicated for twenty-three eyes of thirteen patients after refractive surgeries such as RK(1) ,PRK(2), and LASIK(3). The average of their Uncorrective Visual Acuity (UCVA) after surgeries was 20/30 or worse, and mean spherical equivalent (SE) was -2.42D. They were followed at least two years wearing of Advanced Ortho-K ...
... Title : SURF REFRACTION. COMPUTER REFRACTION PROGRAM. ... The programming in FORTRAN of refraction diagrams is treated. ...
Imaging polarimetry provides spatially resolved information on the polarization properties of a system. In the case of the living human eye, polarization could be related to the corneal biomechanical properties, which vary from the normal state as a result of surgery or pathologies. We have used an aberro-polariscope, which we recently developed, to determine and to compare ...
AimTo document the long term outcome of congenital cataract surgery with primary posterior chamber (PC) lens implantation in the first year of life.MethodA retrospective review of congenital cataract surgery in the first year of life with PC lens implantation in 18 infants, eight with unilateral and 10 with bilateral cataract. The average age at ...
Purpose: To measure ocular aberrations before and at several time periods after LASIK surgery to determine the change to the aberration structure of the eye. Methods: A Shack-Hartmann wavefront sensor was used to measure 88 LASIK patients pre-operatively and at 1 week and 12 months following surgery. Reconstructed wavefront errors are compared to look at ...
We present a new technique, scanning laser retinoscopy, to spatially resolve in two dimensions the optical aberrations and refractive power of the ocular media. For this purpose, the Maxwellian view of a confocal scanning laser ophthalmoscope (SLO) is configured to scan simultaneously the posterior and the anterior segment of the eye at different levels of prefocussing. This ...
PURPOSE:To evaluate the thermal load of ablation in high-speed laser corneal refractive surgery with the AMARIS excimer laser (SCHWIND eye-tech-solutions). METHODS:Thermal load from refractive corrections on human corneas using a 500-Hz laser system with a fluence of 500 mJ/cm(2) and aspheric ablation profiles was recorded with an ...
BACKGROUND: With advances in the delivery of excimer laser energy to the cornea, spherocylindrical ablations are now possible. The refractive and visual outcome of eyes undergoing photoastigmatic refractive keratectomy with a minimum of 12 months follow-up are presented. METHODS: A retrospective analysis of 160 consecutive eyes that underwent ...
Despite the interest in developing improved formulas for intraocular lens power calculation, there are several sources of uncertainty that may well give rise to a significant residual refractive error. Those concerning the estimation of the corneal power are reviewed. In addition, we explore the possibility of introducing changes in some unconventional parameters of the eye to ...
A survey of glaucoma surgery parameters was mailed to all the United States members of the American Society of Cataract and Refractive Surgery in 1999 and 2000. Of the 5659 surveys mailed, 725 (13%) were returned. The survey assessed parameters used in glaucoma surgical treatment. Preferred surgery treatment ...
of keratoconus. Keratoconus, a progressive, non-inflammatory corneal disease, distorts corneal shape and results in poor vision that cannot be corrected with ordinary glasses or contact lenses. Patients with keratoconus for diagnosis and management of keratoconus as well as for the prevention of inappropriate refractive surgery
The history of refractive eye surgery is recent, but has seen rapid advancement. Older technologies, such as radial keratectomy, had the problem of overcorrection and epithelial complications. Newer technologies, such as photorefractive keratectomy, laser-assisted in-situ keratomileusis (LASIK) and laser-assisted subepithelial keratomileusis (LASEK), which ...
many electrodes that are implanted chronically in areas of the cortex. This allows us to investigate of disturbance. Especially in the light of the enormous upswing of corneal procedures in refractive surgery criteria; on corneal lamellar transplants; on glare in driving; etc. Further developments
many electrodes that are implanted chronically in areas of the cortex. This allows us to investigate. Especially in the light of the enormous upswing of corneal procedures in refractive surgery, detailed; on corneal lamellar transplants; on glare in driving; etc. Further developments on the psychophysics
We hypothesize that targeted molecular intervention can preserve vision threatened by battlefield trauma-induced corneal and retinal inflammation, corneal and retina/optic nerve apoptosis, ocular surface dry eye after refractive surgery, and retinal degen...
We hypothesize that targeted molecular intervention can preserve vision threatened by battlefield trauma-induced corneal andretinal inflammation corneal and retina/optic nerve apoptosis ocular surface dry eye after refractive surgery and retinal degenerat...
of corneal aberrations from videokeratography in keratoconus. Journal of Refractive Surgery, 18, 263
A survey of glaucoma laser parameters and practices was mailed to all United States members of the American Society of Cataract and Refractive Surgery (ASCRS) in March 1999. Approximately 19% (947) of the 5100 surveys were returned. The survey assessed parameters used for laser trabeculoplasty, laser iridotomy, and gonioplasty. Respondents also answered ...
We deduce a mathematical equation for corneal asphericity after refractive surgery when the Munnerlyn formula is used. For this, an analytical least-squares procedure is used. The equation explains the discrepancies found by different authors when the Munnerlyn formula or its paraxial approximation is used. Equations for corneal asphericity deduced here ...
Higher-order aberrations degrade visual performance when the pupil is large, particularly in eyes that have abnormally high amounts of aberrations, such as those that have undergone refractive surgery. Geometrical optics predicts that asymmetrical aberrations such as coma can produce orientation selective effects, much like uncorrected astigmatism. Coma is ...
Purpose:? To prospectively study the effect of refractive surgery in the primary visual cortex of adult anisometropic and isometropic myopic patients. Methods:? Two anisometropic and two isometropic myopic patients were examined with multifocal functional magnetic resonance imaging technique (mffMRI) before refractive ...
Nd:glass femtosecond laser is promising as next generation mini-invasive eye surgical laser, with the advantages of excellent beam quality, high surgical precision and minimized side effects. However, there are still many open questions concerning the precision, efficiency and collateral effects of femtosecond laser refractive surgery. By non-invasive ...
The optical elements of rangefinders and their classification into groups with the base at the target station and with the base at the instrument are presented. Linear optical converters using aberration-free plane mirrors are discussed. Nonlinear optical...
... Linear optical converters using aberration-free plane mirrors are discussed. Nonlinear optical converters using telescopic lenses are analysed. ...
JEOL 2200FS-MCO Aberration Free TEM & STEM The first instrument in US with double aberration correctors, one for probe-forming lens, and one for objective lens. It is equipped...
... computer algebra ray tracing package has been updated to include geometric tracing of ... This is simply an infi- nitely thin, aberration-free lens in the ...
BackgroundThe United States officially entered a recession in December 2007, and it officially exited the recession in December 2009, according to the National Bureau of Economic Research. Since the economy may affect not only the volume of excimer laser refractive surgery, but also the clinical characteristics of patients undergoing ...
The presence of local inhomogeneities in corneal tissue after refractive surgery has an influence on visual performance. Here we focus on the corneal ablation associated with Lasik surgery and its effect on the modulation transfer function (MTF) that we obtained by modifying a personalized Kooijman model. Inhomogeneities induced by the ...
Background:? To evaluate the intra-test variability of ARK-30 handheld autorefractor and the agreement with subjective refraction and retinoscopy after uneventful cataract surgery. Design:? Prospective and non-randomized study that included 6 visits by patients undergoing uneventful cataract surgery at IOBA-Eye Institute (University of ...
Cataract surgery is evolving more and more into a refractive procedure with high expectations in terms of visual rehabilitation. Especially patients presenting after previous Excimer laser corneal surgery are used to being independent from glasses. Unfortunately, some of these patients showed unexpected hyperopic surprises after ...
or Injury. 3. Surgery for the correction of refractive error and services and prescriptions for eye of an Injury. 4. Plastic or cosmetic surgery, unless they result directly from an Injury which necessitated. Diagnosis and treatment of acne and sebaceous cyst. 17. Outpatient treatment for specified therapies
providers identified in the provider directory with a "DP". Refractive Surgery Discounts & Cosmetic Eyelid the procedure of blephoraplasty (cosmetic eyelid surgery) to Superior Vision Plan members on the same discount Lenticular Covered in Full Up to $84 Contact Lenses:* Medically Necessary Covered in Full Up to $210 Cosmetic
surgery. This risk is very small and would require a pretty significant trauma to the eye. That being said the correction. We call this an enhancement or re-treatment. Question: Will my eyes be more sensitive to light questions? Question: My eyes get extremely dry when wearing contact lenses. They are not so bad when wearing
Aim: To assess the efficacy and safety of laser in situ keratomileusis (LASIK) for correction of myopic refractive errors in eyes which have previously undergone retinal detachment surgery.Methods: In a prospective, non-comparative case series, 10 eyes of nine patients who had a myopic refractive error and had previously undergone ...
Despite the proven safety and efficacy of laser refractive surgery in improving uncorrected vision, several important issues require further analysis in the armed forces. Visual performance under low light illumination, cockpit performance in military avi...
Ultrafast lasers are suitable for different surgical procedures in the eye: As a main goal in our group, the application of fs-lasers in refractive surgery is studied. Therefore,experiments in living rabbits were conducted, with wound healing studies up to 120 ays after surgery. Moreover,highly precise cuts inside the cornea were used ...
We have investigated the nonlinear refractive index of ex-vivo pig cornea by a combined approach using the standard z-scan technique on extracted corneas or corneal slices, as well as studying the deviations caused by self-focusing during femtosecond laser processing of the pig eyes. The experiments yield consistently an upper limit of 1.2 MW for the critical power of ...
The aim was to develop a software tool for refractive surgeons using a standard user-friendly web-based interface, providing the user with a secure environment to protect large volumes of patient data. The software application was named "Internet-based refractive analysis" (IBRA), and was programmed with the computer languages PHP, HTML and JavaScript, ...
Perfluorocarbon liquids (PFCLs) are one of the most innovative recent tools for vitreoretinal surgery. PFCLs are characterized by their number of carbon atoms, which has an impact on the density, viscosity, surface tension, vapor pressure, the boiling point, and the refraction index. PFCLs are routinely used because of their high gravity (double that of ...
Laser in situ keratomileusis (LASIK) has become the community standard in corneal refractive surgery and is being performed by surgeons in the Army, Navy, and Air Force. LASIK differs from photorefractive keratectomy (PRK) in that a partial-thickness corneal flap is created in the LASIK procedure before removing a microscopic amount of corneal tissue, ...
Infrared thermography is used for evaluation of the mean temperature as a measure of thermal load during corneal refractive surgery. An experimental method to determine emissivity and to calibrate the thermografic system is presented. In a case study on the porcine eye two dimensional temperature distributions with lateral resolution of 170 ?m and line ...
Wavefront-guided laser eye surgery has been recently introduced and holds the promise of correcting not only defocus and astigmatism in patients but also higher-order aberrations. Research is just beginning on the implementation of wavefront-guided methods in optical solutions, such as phase-plate-based spectacles, as alternatives to surgery. We ...
Corneal laser refractive surgery is increasingly being performed on patients with the aim of improving unaided vision. Most candidates for surgery have excellent spectacle- or contact lens-corrected vision. Although microbial keratitis following refractive surgery is a rare complication, and ...
Results of surgery for congenital cataract were studied according to age of implantation, type and polarity. Each forms combined, visual acuity in logMAR is divided by a median of 0.45 (5/10) in bilateral cataracts and 0.7 (2/10) in the unilateral. The precocity of the surgery allows a better prognosis, but exposes to more complications, especially ...
Following the development of the techniques of phacoemulsification and intraocular lens (IOL) implantation as well as the advances of materials of IOL, the better design of aspheric, multifocal and loop surface IOL, the cataract surgery has become a refractive surgery that can enhance the optical performance of the eyes. Therefore, ...
Diode pumped Nd:glass all-solid-state femtosecond laser is promising for next generation refractive surgery, with the advantages of excellent surgical precision, minimal tissue damage and improved system stability and compactness. The microscopic evaluation of the outcome of femtosecond laser surgery is crucial before clinical ...
Purpose: To analyze the prevalence and associations of anisometropia with spherical ametropia, astigmatism, age and sex in a refractive surgery population. Methods: Medical records of 27 070 eyes of 13 535 refractive surgery candidates were reviewed. Anisometropia, defined as the absolute difference in mean ...
OBJECTIVETo evaluate the effect of vision-enhancing interventions (i.e., cataract surgery or refractive error correction) on physical function and cognitive status in nursing home residents.DESIGNLongitudinal cohort study.SETTINGSeventeen nursing homes in Birmingham, AL.PARTICIPANTSA total of 187 English-speaking older adults (>55 years of ...
The strongly localized interaction process of ultrashort laser pulses with tissue makes femtosecond lasers a powerful tool for eye surgery. These lasers are now routinely used in refractive surgery and other forms of surgery of the anterior segment of the eye. Several clinical laser systems also offer options for ...
PURPOSE: To develop a questionnaire, the Refractive Status and Vision Profile (RSVP), to assess health-related quality of life associated with refractive error and its correction. METHODS: The published literature on patient report of visual and overall function was reviewed, and the RSVP was self-administered by 550 participants with ...
An advantage of the LASIK method is the possibility of repeated surgery in case of residual refractive error after the primary surgery. In the second surgery two techniques are used: the technique of the new incision (secondary LASIK) and the technique of corneal flap uncover. The authors evaluate the results of ...
Especially regarding intraocular lenses and refractive corneal surgery, one finds numerous concepts on how to improve the optical quality of the human eye through aspheric optics. Aspheric optics consists of optical surfaces in which at least one surface (for example, the corneal surface) deviates from the spherical shape. An aspheric (that is, not ...
PURPOSE:To report the unexpected induction of astigmatism after phacoemulsification and toric intraocular lens (IOL) implantation in an eye with previous corneal refractive surgery. METHODS:Case report of a 46-year-old man with bilateral nuclear cataract and previous photorefractive keratectomy. Because corneal topography identified regular corneal ...
In 2008, the American Society of Cataract and Refractive Surgery (ASCRS) surveyed its 9121 United States and international members to evaluate the changing trends and incidence, culture results, treatment, and visual outcomes of infectious keratitis following keratorefractive procedures worldwide. This paper presents and analyzes the results with ...
Descemet membrane detachment (DMD) is a rare complication that occurs mainly after cataract surgery. We report the case of a 55-years-old woman who underwent refractive lensectomy. The Day-1�postoperative examination was unremarkable, the Day-7�examination showed corneal oedema related to DMD, which was confirmed by Visante(�) OCT. An intracameral ...
Efficient cornea reshaping by laser irradiation for correcting refractive errors is still a major issue of interest and study. Although the excimer laser wavelength of 193 nm is generally recognized as successful in ablating corneal tissue for myopia correction, complications in excimer refractive surgery leads to alternative laser ...
Refractive cataract surgery has become a reality for the modern phacosurgeon, and control of astigmatism plays a vital role in this quest for optical refractive outcomes. Fortunately, a number of effective options exist to minimize postoperative cylinder. These include placing the cataract incision on the steep corneal meridians; use ...
