We propose a wide-field schematic eye model, which provides a more realistic description of the optical system of the eye in relation to its anatomical structure. The wide-field model incorporates a gradient-index (GRIN) lens, which enables it to fulfill properties of two well-known schematic eye models, namely, Navarro's model for off-axis aberrations and Thibos's chromatic on-axis model (the ...

BACKGROUND AND PURPOSE To our knowledge, there has been no study that compares the radiation dose delivered to the eye lens by 16- and 64-section multidetector CT (MDCT) for standard clinical neuroimaging protocols. Our aim was to assess radiation-dose differences between 16- and 64-section MDCT from the same manufacturer, by using near-identical neuroimaging protocols. MATERIALS AND METHODS ...

The knowledge related to contact lens wear and practice care of contact lenses among medical students of University of Malaya was assessed through a structured questionnaire. One hundred and twenty-one contact lens wearers participated in this study. Majority of contact lens wearers were females (106, 87.6%); the duration of contact lens wear varied from less than six months to two years or mor...

A 39-year-old man with pathologic myopia and a dislocated native lens of the right eye underwent pars plana lensectomy and implantation of an iris-fixated 3-piece MA60MA foldable acrylic intraocular lens with -5.0 diopter power. The patient presented 11 months later with spontaneous haptic disinsertion from the optic. The meniscus (concave-convex) configuration of this iris-fixated lens may hav...

BACKGROUND Lens dislocation is a common disease in ophthalmology, which leads to vision loss, while the lens dislocation caused by vomiting has not been reported yet. We report a case of lens dislocation caused by simple vomiting. This case further implicated for the pathogenesis of lens dislocation. CASE PRESENTATION A 51-year-old male who complained about "dizziness, vomiting, and the visio...

PURPOSE Within a mutagenesis screen, we identified the new mouse mutant Aca47 with small lenses and reduced axial eye lengths. The aim of the actual study was the molecular and morphological characterization of the mouse mutant Aca47. METHODS We analyzed the offspring of paternally N-ethyl-N-nitrosourea (ENU) treated C57BL/6J mice for eye-size parameters by non-invasive in vivo laser interfer...

Since the beginning of the century the generally accepted scheme of eye/lens development has been that proposed by Spemann (1901) and later confirmed by numerous workers. According to this scheme the two presumptive components of the definitive eye, the optic cup and the lens, are spatially separated at the flat neural plate stage. They later come into apposition as a result of tissue movements...

PURPOSE To measure the wavefront aberration at different locations in progressive-power lenses (PPL's) isolated and in situ (PPL's plus eye). METHODS A Hartmann-Shack wavefront sensor was used to measure progressive-power lenses and human eyes either independently or in combination. In each selected zone, the lens was placed and tilted accordingly to simulate natural viewing conditions. We me...

OBJECTIVE To investigate possible injury mechanisms in the eyes of elderly individuals and the effects of lens stiffness on model outputs indicative of injury as a function of age. METHODS Three separate frontal impact scenarios, a foam particle (30 m/s), steering wheel (15 m/s), and air bag (67 m/s), were simulated with a validated finite-element model to determine the effects of changing le...