PURPOSE To compare changes in the corneal wavefront aberrations after photorefractive keratectomy and laser in situ keratomileusis. METHODS In a prospective randomized study, 22 patients with bilateral myopia received photorefractive keratectomy on one eye and laser in situ keratomileusis on the other eye. The procedure assigned to each eye and the sequence of surgery for each patient were ra...

In the last two decades, corneal laser surgery has become a common procedure to correct medium-low refractive defects. It consists of reshaping geometry by means in order present error. this work, we compare opto-mechanical performance procedures: Photorefractive Keratectomy (PRK) and Small Incision Lenticule Extraction (SMILE).

PURPOSE We investigated the keratocyte response and stromal remodeling after corneal incision and photorefractive keratectomy to understand the histophysiological and immunohistochemical differences between these two types of surgery. METHODS Corneal incision or photorefractive keratectomy was performed in rabbits or rats. Then we chronologically observed the histological changes and the chan...

purpose : to assess the safety, efficacy and predictability of photorefractive keratectomy (prk) [tissue-saving (ts) versus plano-scan (ps) ablation algorithms] of technolas 217z excimer laser for correction of myopic astigmatism methods : in this retrospective study one hundred and seventy eyes of 85 patients (107 eyes (62.9%) with ps and 63 eyes (37.1%) with ts algorithm) were included. ts al...

BACKGROUND The purpose of this study was to compare differences in visual outcomes, higher-order aberrations, contrast sensitivity, and dry eye in patients undergoing photorefractive keratectomy using wavefront-guided VISX CustomVue™ and wavefront-optimized WaveLight(®) Allegretto platforms. METHODS In this randomized, prospective, single-masked, fellow-eye study, photorefractive keratectomy ...

PURPOSE To report the effect of wavefront-guided photorefractive keratectomy and corneal collagen cross-linking (CXL) on visual problems after Ferrara ring segment placement. MATERIALS AND METHODS A 32-year-old male patient was treated with a Ferrara ring segment for keratoconus. One year later, the ring was removed due to severe glare complaints. After 6 months, wavefront-guided photorefract...

PURPOSE To report a specific line of research developed at the University of São Paulo/Brazil on fibrin glue used for sealing corneal perforations and the perspectives of use on non-perforated corneal ulcers and photorefractive keratectomy-operated corneas. METHODS To describe fibrin glue manufacture, development of a device to test the glued perforated corneal area resistance, subsequent exp...

PURPOSE To describe a topographically guided photorefractive keratectomy technique for the management of secondary hyperopia following radial keratectomy. METHODS A retrospective study was carried out in patients where a topographically guided photorefractive keratectomy technique was performed for the management of secondary hyperopia following radial keratectomy. The patients had preoperati...