Modelisation and simulation of promising non linear optical materials such as photorefractive materials is a field which generates complexity. The involved non linear phenomena imply the use of highly numeric, computer intensive methods. The simulation of the propagation of an optical pulse in a photorefractive non linear media is here simulated thanks to the collaboration between physicists an...

PURPOSE To study the long-term results of photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) in low to moderate myopic corrections using the Pulzar Z1 system (CustomVis), a 213 nm wavelength solid-state laser. SETTING University refractive surgery center. METHODS This prospective noncomparative case series comprised 20 patients (40 eyes) who had refractive surgery us...

background: photorefractive keratectomy is a popular mean to correct refractive errors of the eye and haze formation is one of the most important complications of the surgery. although standard dose of intraoperative mitomycin c has shown to be effective in reduction of this complication, potential side effects of mitomycin c promote us to show if the lower concentration of mitomycin c has t he...

PURPOSE To compare quantitative changes induced in the tear film of patients submitted to photorefractive keratectomy and LASIK over a year. METHODS A prospective, longitudinal, comparative, post-interventional study was designed to distinguish tear film changes before and one year after refractive surgery procedures in 48 patients submitted to PRK and 36 patients submitted to LASIK, using ty...

The improvements in excimer laser technology made hyperopic excimer refractive surgery a valuable option for hyperopia correction. However, despite the good visual and refractive outcomes of excimer laser photorefractive keratectomy (PRK) and laser in situ Keratomileusis (LASIK) treatments, they are more effective and stable for the correction of low degrees of hyperopia than high hyperopia1-7....

The past decade has witnessed the revival of amniotic membrane transplantation (AMT) in ophthalmology. The importance of amniotic membrane lies in its ability to reduce inflammation and scarring, enhance epithelialization and wound healing, and in its antimicrobial properties. Amniotic membrane has recently been used as a substrate for culturing limbal stem cells for transplantation. It has als...

purpose : to report a case of bilateral dense ring-shaped marginal keratitis after photorefractive keratectomy (prk) case report : a 44-year-old man developed bilateral dense ring-shaped marginal keratitis after prk. the patient had moderate to severe meibomian gland dysfunction preoperatively that was treated incompletely. he was treated with mild topical antibiotics, topical and systemic ster...