SIX-MONTHS RESULTS OF PHOTOREFRACTIVE KERATECTOMY FOR MYOPIA WITH OR WITHOUT ASTIGMATISM WITH 193 NM MICROSCAN VISUM EXCIMER LASER FOR REFRACTIVE SURGERY

To evaluate the clinical and refractive outcomes over a 6-month period following photorefractive keratectomy (PRK) using the Microscan Visum Excimer Laser.

University of Crete, Medical School, Institute of Vision and Optics. 

This study involved healthy patients with myopia with or without astigmatism, who were enrolled for refractive surgery and treated with PRK using the Microscan Visum 193 nm, 1100 Hz repetition rate, (Microscan Visum, OptoSystems, Russia). All participants underwent examinations at baseline, and at 1, 3, and 6 months post-operatively. The examinations included slit lamp evaluation, refraction, visual acuity assessment (logMAR chart), tonometry, ophthalmoscopy, and Scheimpflug corneal tomography. Post-operatively assessment included uncorrected (UDVA) and corrected (CDVA) distance visual acuities, refraction. The efficacy, safety, predictability, and stability of the procedure were also evaluated.

The study included 90 eyes from 50 patients. The mean uncorrected distance visual acuity (UDVA) improved from 1.00 ± 0.14 to 0.04 ± 0.09 logMAR at 6 months, while the mean corrected distance visual acuity (CDVA) improved from 0.02 ± 0.06 to 0.002 ± 0.08 logMAR. The mean spherical equivalent (SE) shifted from -3.13 ± 1.72 D to 0.09 ± 0.39 D, with 90% of eyes achieving a correction within ±0.50 D of the intended target and 98.9% within ±1.00 D at 6 months. No eyes experienced a loss of visual acuity, and 59.6% of eyes gained one or more lines of best-corrected visual acuity.

Photorefractive keratectomy (PRK) using the 193 nm, 1100 Hz repetition rate, Microscan Visum system demonstrated favorable visual, refractive, and clinical outcomes at the 6-month follow-up.