Effect of larger ablation zone and transition zone on corneal optical aberrations after photorefractive keratectomy.

Objective: To evaluate the effects of photorefractive keratectomy on corneal optical aberrations using a 5.5-mm optical zone and a 7.0-mm transition zone.

Change in intraocular pressure in myopic eyes measured with contact and non-contact tonometers after laser in situ keratomileusis.

Purpose: To study the change in the intraocular pressure (IOP) after laser in situ keratomileusis (LASIK) for correction of myopia.

Methods: One hundred twenty consecutive myopic eyes (60 patients) were included in a prospective study. All eyes received LASIK with the Nidek EC-5000 excimer laser and the Chiron Automated Corneal Shaper.

Diurnal fluctuations in corneal topography 10 years after radial keratotomy in the Prospective Evaluation of Radial Keratotomy Study.

Purpose: To correlate clinically observed fluctuations in manifest refraction, visual acuity, keratometry, and intraocular pressure (IOP) with changes in the anterior corneal surface as measured by videokeratography in patients 10 years after radial keratotomy (RK).

Setting: Four clinical centers in the United States that participated in the Prospective Evaluation of Radial Keratotomy (PERK) study.

Methods: Thirty-two eyes of 20 PERK patients who noted diurnal fluctuations in vision had clinical examination and videokeratography (TMS-1, Computed Anatomy Inc.

Corneal topography of small-beam tracking excimer laser photorefractive keratectomy.

Purpose: To evaluate the topographic characteristic of photorefractive keratectomy (PRK) for low myopia performed with a small-beam (0.9 mm) tracking excimer laser.

Setting: Department of Ophthalmology, LSU Eye Center, Louisiana State University Medical Center School of Medicine in New Orleans, and the Refractive Surgery Center of the South at the Eye, Ear, Nose, & Throat Hospital, New Orleans, Louisiana, USA.