Development of unilateral corneal ectasia after PRK with ipsilateral preoperative forme fruste keratoconus.

Purpose: To describe clinical and topographic features of keratectasia after photorefractive keratectomy (PRK) in a patient with abnormal preoperative topography.

Methods: A 25-year-old man underwent uneventful bilateral PRK for moderate myopia of -5.75 -1.

Femtosecond laser keratome creation of partial thickness donor corneal buttons for lamellar keratoplasty.

Purpose: To evaluate the thickness and diameter accuracy of the IntraLase femtosecond laser in harvesting corneal discs for lamellar keratoplasty. The stromal bed quality of resected corneas was evaluated by scanning electron microscopy.

Methods: Two IntraLase units were used to create corneal discs at 225-, 300-, 400-, and 500-microm thickness settings and 7-, 8-, 8.

Pupil size and corneal laser surgery.

Purpose Of Review: The role of scotopic pupil size as a factor in predicting night vision complaints is controversial. This review summarizes reports in the literature, some that have found and some that have failed to find a correlation with scotopic pupil size and night vision complaints.

Recent Findings: Pupil-measuring devices are discussed along with informed consent issues and reports showing that wavefront aberrations increase with increasing pupil size.

Intraoperative optical refractive biometry for intraocular lens power estimation without axial length and keratometry measurements.

Purpose: To correlate intraoperative aphakic autorefraction to conventional emmetropic intraocular lens (IOL) calculations and derive an empiric predictive model for IOL estimation based on optical refractive biometry without axial length and keratometry measurements.

Setting: Institutional Review Board of the University of Southern California, Los Angeles County General Hospital, Los Angeles, California, USA.

Methods: A pilot group of 22 eyes of 22 patients scheduled for cataract surgery were enrolled in a prospective trial.

Wavefront-guided treatment for previous laser in situ keratomileusis and photorefractive keratectomy: case reports.

Purpose: To describe the off-label use of the Alcon LADARVision System for CustomCornea (LADARWave and LADARVision4000) in two patients, one for retreatment after laser in situ keratomileusis (LASIK) and one for retreatment after photorefractive keratectomy (PRK).

Methods And Results: Both patients were unhappy with the quality of their vision after initial refractive surgery. The first patient initially had LASIK to correct -4.

Photorefractive keratectomy for treatment of flap complications in laser in situ keratomileusis.

Purpose: To present the results of photorefractive keratectomy (PRK) for treatment of laser in situ keratomileusis (LASIK) flap complications.

Methods: Compilation of case reports through solicitation on Kera-net, an Internet surgery discussion site.

Results: PRK was performed on 13 patients from 2 weeks to 6 months after LASIK flap complications.

Analysis of intraocular lens power calculation in post-radial keratotomy eyes.

Purpose: To determine whether refractive complications can be prevented by applying the currently most accurate method of intraocular lens (IOL) power calculation in the post-radial keratotomy (RK) patient.

Setting: Department of Ophthalmology, University of California, Davis, Sacramento, and American Eye Institute, Cedars Sinai Medical Center, Los Angeles, California, USA.

Methods: Twenty-four eyes having cataract surgery after RK were studied retrospectively for the final postcataract refraction and for the target refraction used in selecting the IOL.

LASIK correction of spherical hyperopia, hyperopic astigmatism, and mixed astigmatism with the LADARVision excimer laser system.

Objective: To assess the safety and effectiveness of the LADARVision active tracking narrow beam excimer laser system (Alcon Surgical, Orlando, FL) using laser in situ keratomileusis (LASIK) for correction of spherical hyperopia, hyperopic astigmatism, and mixed astigmatism.

Design: A multicenter, prospective non-randomized (self-controlled) comparative trial.

Participants: A total of 360 eyes, including 152 spherical hyperopic, 143 hyperopic astigmatic, and 65 mixed astigmatic, were treated for up to +6.

Surgical correction of hyperopia: clear lens extraction and laser correction.

Modern ophthalmology offers a series of surgical procedures to correct a wide range of hyperopia and hyperopic astigmatism. Varies excimer lasers and thermal lasers have been proven safe and effective. Phakic implants and clear lens extraction offers alternatives for moderate to high hyperopic patients.

Laser in situ keratomileusis for myopia up to -11 diopters with up to -5 diopters of astigmatism with the summit autonomous LADARVision excimer laser system.

Objective: To assess the safety and effectiveness of the Summit Autonomous LADARVision active tracking narrow beam excimer laser system for laser in situ keratomileusis (LASIK) correction of myopia and astigmatism.

Design: A multicenter, prospective noncomparative case series.

Participants: This cohort consisted of 177 eyes corrected for spherical myopia up to -11 diopters (D) and 170 eyes corrected for myopia up to -11 D spherical equivalent with astigmatism up to -5 D.

Photorefractive keratectomy for low-to-moderate myopia and astigmatism with a small-beam, tracker-directed excimer laser.

Objective: To assess the safety and effectiveness of the Autonomous Technologies Corporation LADARVision excimer laser system for photorefractive keratectomy correction of myopia and astigmatism.

Design: A multicenter, prospective, noncomparative case series.

Participants: The cohort consisted of 467 eyes corrected for spherical myopia and 211 eyes corrected for myopia with astigmatism.

Clear lens extraction with intraocular lens implantation for hyperopia.

Purpose: Current surgical options for the correction of moderate to severe hyperopia include hyperopic laser in situ keratomileusis (LASIK), phakic intraocular lens implantation and clear lens extraction with intraocular lens (IOL) implantation. We investigate the safety and efficacy of clear lens extraction with IOL implantation to correct hyperopia.

Methods: Phacoemulsification and IOL implantation was performed on 18 eyes of 10 patients.

Refractive keratotomy after photorefractive keratectomy.

Background: The current surgical procedures available for the treatment of residual myopia and/or astigmatism after photorefractive keratectomy (PRK) include refractive keratotomy, laser in situ keratomileusis (LASIK), repeat PRK, or photorefractive astigmatic keratectomy (PARK). In this study, we investigate the safety and efficacy of refractive keratotomy for the correction of residual myopia and/or astigmatism after PRK.

Methods: Ten eyes of 9 patients underwent refractive keratotomy after excimer laser photorefractive keratectomy using the Lindstrom nomogram.

Bilateral photorefractive keratectomy with intentional unilateral undercorrection in an aircraft pilot.

An aircraft pilot had bilateral photorefractive keratectomy (PRK) with intentional undercorrection in the nondominant eye for best uncorrected far and near visual acuity (monovision). After PRK, the patient was able to pilot an aircraft with no deleterious effects directly related to surgery. Evaluation of similar cases and further study will allow consensus on whether PRK is appropriate in these patients.

Retrospective comparison of photorefractive keratectomy and radial keratotomy.

Background: The efficacy and predictability of photorefractive keratectomy and radial keratotomy become increasingly relevant. This retrospective study compares one surgeon's experience with photorefractive keratectomy and radial keratotomy over a 3-year period from 1990 to 1993.

Methods: Photorefractive keratectomy was performed on 103 eyes of 76 patients that met the inclusion criteria for the phase IIb, phase III, and phototherapeutic keratectomy studies as delineated by the United States Food and Drug Administration.

Keratoconus detected by videokeratography in candidates for photorefractive keratectomy.

Background: Patients with corneal shape abnormalities should be identified prior to photorefractive keratectomy (PRK). We used videokeratography screening to detect subclinical corneal abnormalities, including keratoconus, which might have been missed by conventional clinical evaluation.

Methods: One hundred forty-six apparently normal myopic eyes (-1.

Excimer laser photorefractive keratectomy after radial keratotomy.

Background: Correction of residual myopia after radial keratotomy may be attempted with repeated keratotomy surgery, but predictability can be less than satisfactory. Excimer laser photorefractive keratectomy (PRK) provides an alternative approach to improving the refractive result in these patients.

Methods: Twenty-five eyes of 20 patients at five clinical locations underwent PRK for residual myopia after radial keratotomy.