Background: It is known that pterygia above a certain size cause astigmatism and other aberrations of the human cornea thus impair quality vision. Exclusive Sr-/Ytt-90 beta irradiation highly effective treatment for primary pterygia. The aim this retrospective study to determine extent which higher order corneal are affected by treatment. Methods: Evaluation topographies wavefront aberration da...

background traumatic brain injury (tbi) is an important public health problem throughout the world. objectives the aim of this study was to assess repeated glasgow coma scale (gcs) scores in predicting the severity of tbi and patients’ survival. patients and methods in this longitudinal study used a total sample of 239 patients, all of whom were hospitalized with traumatic brain injuries. subje...

PURPOSE To investigate the relations between age and the optical aberrations of the whole eye. The eye's optical quality, as measured by the modulation transfer function (MTF), degrades with age, but the MTF does not provide a means to assess the contributions of individual aberrations, such as coma, spherical aberration, and other higher order aberrations to changes in optical quality. The met...

PURPOSE To evaluate astigmatism correction, visual performance, intraocular lens (IOL) position, and wavefront error after implantation of toric IOLs in patients with cataract. METHODS This prospective study comprised 30 eyes of 30 patients with cataract who were candidates for phacoemulsification and implantation of the AcrySof toric IOL (Alcon Laboratories, Inc., Fort Worth, TX). Mean preop...

PURPOSE To evaluate the in vivo aberrometric performance of two phakic intraocular lenses (PIOLs); the Visian implantable contact lens (ICL) and the AcrySof Cachet PIOL. METHODS Thirty eight eyes from 29 patients with an age range of 23-32 years and more than 9 D of myopia were divided into two groups; one group of 20 eyes received a Visian ICL model V4c, another group of 18 eyes received an ...

PURPOSE To study the effects of ocular lubricants on higher order aberrations in normal and self-diagnosed dry eyes. METHODS Unpreserved hypromellose drops, Tears Again™ liposome spray and a combination of both were administered to the right eye of 24 normal and 24 dry eye subjects following classification according to a 5 point questionnaire. Total ocular higher order aberrations, coma, sphe...

Purpose. To assess the clinical and morphological outcomes of topography-guided accelerated corneal cross-linking. Design. Retrospective case series. Methods. 21 eyes of 20 patients with progressive keratoconus were enrolled. All patients underwent accelerated cross-linking using an ultraviolet-A (UVA) exposure with an energy release varying from 7.2 J/cm2 up to 15 J/cm2, according to the topog...

A schematic eye model based on anatomical data, which had been previously designed to reproduce image quality on axis, has been transformed into a wide-angle model by simply adding a spherical image surface that plays the role of the retina. This model captures the main features of the wide-angle optical design of the human eye with minimum complexity: four conic optical surfaces plus a spheric...

PURPOSE To evaluate the distance and near functional capacity, wavefront error and biocompatibility in patients with 2 diffractive multifocal intraocular lenses (MIOLs). SETTING Ophthalmology Department of Chieti-Pescara University (Italy). METHODS This prospective study comprised 28 eyes of 28 senile cataract patients having phacoemulsification and implantation of the Tecnis ZM900 MIOL (Gr...