Purpose: To evaluate the safety, efficacy, and predictability of excimer laser in situ keratomileusis (LASIK) to correct residual myopia and astigmatism after penetrating keratoplasty (PKP).
Setting: Buzard Eye Institute, Las Vegas, Nevada, USA.
Methods: Twenty-six eyes had LASIK at least 1 year after PKP.
Purpose: To evaluate hyperopic surgical correction with 6.0 mm optical zone hyperopic laser in situ keratomileusis (LASIK) after various refractive procedures.
Setting: Buzard Eye Institute, Las Vegas, Nevada, USA.
Introduction: Constitutive properties of the cornea and wounds within the cornea have been measured previously by destructive methods in which a strip of cornea was removed, placed on an instrument, and stretched until broken. To assess corneal wound healing and the interaction of medication, incision patterns and other clinical issues, we present a simple, noninvasive test of corneal wound healing utilizing a videokeratoscope and Honan balloon.
Methods: A pre-test corneal topography was performed.
Background: Four basic types of irregular astigmatism are described: central elevation, central flat area, eccentric elevation, and eccentric flat area.
Methods: The importance of the Munnerlyn formula is shown for the treatment of irregular astigmatism. A new diagnostic entity is described, the steep/flat ratio, modeled on the inferior/superior ratio described previously in keratoconus.
J Cataract Refract Surg
April 1997
Purpose: To evaluate the results and complications rates associated with corneal transplantation for keratoconus and assess the prospects of using penetrating keratoplasty at a much earlier stage.
Setting: Buzard Eye Institute, Las Vegas, Nevada, USA.
Methods: In this prospective clinical study, 104 eyes of 76 patients had corneal transplantation for keratoconus identified by corneal topography, keratometry, pachymetry, and/or retinoscopy.
Purpose: To compare a modified automated lamellar keratoplasty (ALK) technique that uses two blades with the original technique, which uses one blade.
Setting: Buzard Eye Institute, Las Vegas, Nevada.
Methods: This study comprised 142 eyes of 85 patients who had ALK: 107 using the original one-blade technique (Group 1) and 35 eyes using the modified two-blade technique (Group 2).
J Cataract Refract Surg
October 1996
Purpose: To examine the safety and efficacy of primary combined phacoemulsification, posterior chamber intraocular lens (IOL) implantation, and trabeculectomy with mitomycin-C (0.4 mg/ml) in patients with open-angle glaucoma and visually significant cataract.
Setting: University-hospital-based glaucoma referral practice.
Purpose: To evaluate the effectiveness of arcuate incisions for correcting congenital, post-cataract, post-radial keratotomy, and post-trapezoidal keratotomy astigmatism.
Setting: Buzard Eye Institute, Las Vegas, Nevada.
Methods: In this retrospective study, 46 eyes of 29 patients had arcuate incisions to correct astigmatism.
Three case studies are presented illustrating topographic transient central steep island following radial keratotomy. Three stages are apparent: first, a central corneal steepening; next, an overcorrection with exaggerated central flattening; and, finally, the final refractive correction. The steepening is probably caused by temporary midperipheral swelling of the cornea.
View Article and Find Full Text PDFJ Refract Surg
October 1996
Background: Accurate, predictable, and safe refractive surgery requires immobilization of the eye. We measured the effects of current eye fixation techniques on human cadaver eyes.
Materials And Methods: Central to our study was a device specially designed to secure cadaver eyes and stabilize intraocular pressure.
Purpose: To evaluate the refractive results of 193-nm excimer laser photorefractive keratectomy (PRK) performed on 48 highly myopic eyes in a multicenter study.
Methods: A Visx 2015 or 2000 argon-fluoride excimer laser and a single-zone ablation technique were used. Postoperatively, eyes were treated with topical fluoromethalone for up to 5 months.