Assumptions on the allocation of attention during reading are crucial for theoretical models of eye guidance. The zoom lens model of attention postulates that attentional deployment can vary from a sharp focus to a broad window. The model is closely related to the foveal load hypothesis, i.e., the assumption that the perceptual span is modulated by the difficulty of the fixated word. However, t...

PURPOSE This study aimed to determine the eye movement parameter(s) that is primarily affected when fully sighted subjects use plus-lens magnifiers for reading. METHODS Two forms of plus-lens magnifier were used: hand-held and spectacle-mounted. Eye movements were recorded using an infrared limbal reflection system as subjects read passages of text with and without the magnifiers. Data were c...

PURPOSE The small GTPases function as "molecular switches" by binding and releasing GTP to mediate downstream signaling effects. The Rho-family of GTPases is central in modulating cell differentiation and cytoskeletal changes. Since eye development requires comprehensive morphogenetic movements and extensive cellular differentiation, we hypothesize that different small GTPases may play importan...

The advances in digital imaging and the improvement in interventional tools and devices like catheters and stents have expanded the use of interventional procedures. During the period 1998-2008, the total number of interventional procedures increased by 78% [1]. Interventional radiology [IR] and cardiology [IC] procedures deliver high radiation doses both to patients and medical personnel, whic...

Introduction: Based on the invasive studies it has been shown that factors such as age, the progress of eye disorders, lens fibers compression and the biochemical changes of ocular matrix alter the physical characteristics and elastic properties of eye. In this study, a noninvasive method of estimating human eye elasticityis proposed and its relation with age and gender is evaluated using ultra...

The proposed system is for designing progressive lenses. This method permits generation of lens design based on the head and eye movements of an individual. For this a camera is used for imaging the head and eye of a person. It relies on tracking algorithms to robustly track a person’s head and eye movements. This system classifies rotation in all viewing directions, and detects head movements....

Medical records of a 46‐year‐old woman with bilateral myopia, gyrate atrophy, and history of night blindness were reviewed. The patient underwent macular hole surgery in the left eye 3 years back. The surgery consisted of pars plana vitrectomy (PPV), induction of posterior vitreous detachment (PVD), internal limiting membrane (ILM) peeling, and fluid‐air exchange. She had serum ornithine level ...

PURPOSE The authors have previously shown a marked increase in corneal epithelial arachidonic acid metabolism to 12-hydroxyeicosatetraenoic acid (12-HETE) and 12-hydroxyeicosatrienoic acid (12-HETrE) in a model of closed eye-contact lens wear. Their formation was predominantly cytochrome P450-dependent and significantly correlated with inflammatory score and corneal thickness. In the current st...

purpose: to report the development of cataract after corneal damage by dungle beetle prongs. case report: a 28 year-old man, resident of the village chah setareh, sabzevar, presented complaining of trauma to the right eye with the dangle beetle while motorcycling. slit lamp examination revealed six corneal perforations, hyphema (50% of anterior chamber) percent, iris sphincter rupture, and rupt...