Central Islands and Visual Outcomes of Phototherapeutic Keratectomy Using the Photorefractive Keratectomy Mode

Purpose: To compare the rate of central island (CI) and visual acuity after phototherapeutic keratectomy (PTK) with and without the CI program. Methods: This retrospective study comprised 147 eyes of 89 consecutive patients (mean age ± SD, 71.1 ± 9.6 years) undergoing PTK with and without the anti-CI program [photorefractive keratectomy (PRK) mode and PTK mode] using the VISX Star S4 excimer laser system (Johnson & Johnson Vision, Santa Ana, US) for treatment of band keratopathy (BK) or granular corneal dystrophy (GCD). The rate of CI formation, defined as a steepening area of 3 D, 1.5 mm in diameter, on each corneal videokeratographer (ATLAS 9000; Carl Zeiss Meditec, Jena), and best spectacle-corrected visual acuity (BSCVA) were assessed 3 months after PTK. Results: We found CI formation in 17 eyes (22%) in the PRK mode group and 45 eyes (73%) in the PTK mode group at 3 months postoperatively (P
Source: Cornea - Category: Opthalmology Tags: Clinical Science Source Type: research