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.

Five and three year follow-up of photorefractive keratectomy for myopia of -1 to -6 diopters.

Background: To report the 5 and 3 year results of photorefractive keratectomy for -1 to -6 D of myopia and less than 1.50 D astigmatism.

Methods: All eyes were treated with a VISX 20/20 excimer laser with an ablation diameter of 5 mm.

The effect of excimer laser photorefractive keratectomy on intraocular pressure measurements using the Goldmann applanation tonometer.

Purpose: The authors determined whether photorefractive keratectomy (PRK) affects Goldmann applanation readings in human eyes.

Methods: The intraocular pressure (IOP) of 111 patients was measured using Goldmann applanation tonometry at baseline and 12 months after PRK. Ultrasonic corneal thickness measurements and keratometry were also obtained.

Ablation zone centration after photorefractive keratectomy and its effect on visual outcome.

Purpose: To determine the relation between ablation zone decentration, measured by corneal topography, and visual and refractive outcome, contrast sensitivity, glare, and subjective reports of halos after photorefractive keratectomy (PRK).

Setting: Eye Foundation, University of Missouri-Kansas City School of Medicine.

Methods: This study comprised 70 eyes of 70 patients enrolled into Phase III of the clinical investigation of the VISX 20/20 excimer laser for the correction by PRK of 1.

Excimer retreatment for myopic photorefractive keratectomy failures. Six- to 18-month follow-up.

Purpose: To study the results of retreatment after myopic photorefractive keratectomy in 22 patients. Five patients showed regression and 17 showed undercorrection combined with regression. The follow-up was 6 to 18 months.