purpose: to compare visual outcomes and changes in high-order aberrations (hoas) following conventional versus customized photorefractive keratectomy (prk). methods: in this clinical trial, 58 eyes of 29 patients underwent myopic prk using the technolas 217z excimer machine. after comprehensive evaluation for refractive surgery, one eye of each participant randomly received conventional ablatio...

PURPOSE To evaluate preliminarily the safety and efficacy of customized photorefractive keratectomy (PRK) to correct ametropia and irregular astigmatism after penetrating keratoplasty (PK). METHODS This pilot study included five eyes of five patients with a mean spherical equivalent of -5.1±1.46D (range from -2.75 to -6.50D). In all cases, ametropia and irregular astigmatism was corrected wit...

PURPOSE To evaluate the safety and efficacy of customized transepithelial photorefractive keratectomy (PRK) for the correction of iatrogenic ametropia after penetrating keratoplasty (PKP) or deep lamellar keratoplasty. SETTING Eye Clinic, Department of Neurological and Visual Sciences, University of Verona, Verona, Italy. METHODS This study comprised 9 patients who had irregular astigmatism...

The aim of this study was to determine the change in the degree of astigmatism in patients treated with customized ablation photorefractive keratectomy (PRK). This is a cross-sectional study that involved 92 otherwise healthy subjects with regular and irregular astigmatism ≥ 1.25 D (mean age: 39.09 ± 7.72 years; range: 20-59 years). All study subjects were treated with customized ablation PRK u...

PURPOSE To evaluate the efficacy and safety of topographically guided excimer laser photoablation to retreat unsuccessful myopic and hyperopic photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK). SETTING Eye Clinic, San Salvatore Hospital, University of L'Aquila, L'Aquila, Italy. METHODS At least 3 months after primary PRK (Group A) or primary LASIK (Group B), 48 eyes...

to compare the refractive and visual outcomes and higher order aberrations in patients with low to moderate myopia who underwent customized photorefractive keratectomy (prk) or  femtosecond laser in situ keratomileusis (femto-lasik) this study performed this research includes data of 120 consecutive eyes of 60 patients with myopia between -3.00 d and -7.00 d with or without astigmatism in two s...

Steep central island (SCI) formation after photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) represents a major drawback in the visual rehabilitation of patients after refractive laser surgery. Because of the small size of SCIs, current ablation algorithms are unable to properly calculate an ablation pattern for customized retreatment. We present the use of a new ablati...

BACKGROUND The purpose of this paper is to report the results of using combined treatment of customized excimer laser-assisted photorefractive keratectomy (PRK) and prophylactic corneal collagen crosslinking (CXL) for residual refractive error in a group of patients who had previously undergone lamellar keratoplasty for keratoconus. METHODS The study included 14 eyes from 14 patients who had ...

To compare the refractive and visual outcomes and higher order aberrations in patients with low to moderate myopia who underwent customized photorefractive keratectomy (PRK) or femtosecond laser in situ keratomileusis (Femto-LASIK) this research performed. This study includes data of 120 consecutive eyes of 60 patients with myopia between -3.00 D and -7.00 D with or without astigmatism in two s...