Cataract maturation is associated with anteroposterior lens diameter increase which, in some patients, particularly those with anatomically narrow anterior chambers, can lead to pupillary block and peripheral iridotrabecular apposition [1,2]. In other patients with previously deep anterior chambers and wide open angles, the cataract may become so swollen that it physically pushes the iris anter...

This paper continues the assessment of the long-term merits and problems of intraocular acrylic lenses which was started by a consideration of the value of the Binkhorst iris clip lens in aphakia by Pearce (I972). The reduced degree of aniseikonia and the better opportunity for binocular vision when uniocular aphakia is corrected by an intraocular lens implant was emphasized by Girard, Friedman...

Some fish exist as eyed, surface-dwelling and eyeless, cave-dwelling forms. The developmental processes that cause eye degeneration in different populations of Astyanax cavefish are similar. Although small optic primordia start to form, apoptosis of lens cells triggers developmental arrest and degeneration of the eyes. Degeneration has been linked to reduced expression of the transcription fact...

Reflectance spectroscopy is a promising technology for detection of epithelial precancer. Fiber-optic probes that selectively collect scattered light from both the epithelium and the underlying stroma are likely to improve diagnostic performance of in vivo reflectance spectroscopy by revealing diagnostic features unique to each layer. We present Monte Carlo models with which to evaluate fiber-o...

METHODS: Retrospective case-control study. A total of 60 patients were studied, 30 who had undergone cataract surgery and implantation of an AcrySof® hydrophobic acrylic intraocular lens (IOL) 10 years or more prior to the study, and 30 who had undergone the surgery just 1 month prior to the study. The groups were compared in terms of bestcorrected visual acuity, contrast sensitivity and densit...

We report on a new optics design for an optical coherence tomography (OCT) balloon imaging catheter. The design involves a miniature compound gradient-index (GRIN) rod lens, which consists of a fiber optic mode-field reducer and relay rod lenses to achieve predictable high lateral resolution at a desired large working distance. The compound lens design significantly simplifies the engineering p...

A 2-month-old female infant had bilateral congenital cataract. In the left eye a blood clot was situated on the subcapsular polar cataract. An uneventful lensectomy combined with anterior vitrectomy by the pars plicata approach revealed remnants of the posterior portion of hyaloid artery on the optic nerve head. It is likely that the spontaneous and long-lasting haemorrhage in the lens had been...

An implementation of Scott's 'four-line' algorithm for estimating optic flow is presented. The application is the analysis of cataract motion in the human eye lens. Images are recorded using retro-illumination photography. Successive images recorded at up to a 6 month interval are used as the source for the flow recovery procedure. The four-line algorithm itself uses edge data from these images...

We experimentally address the wave-vector and polarization dependence of the internal conical refraction phenomenon by demonstrating that an input light beam of elliptical transverse profile refracts into two beams after passing along one of the optic axes of a biaxial crystal, i.e. it exhibits double refraction instead of refracting conically. Such double refraction is investigated by the inde...

A 51-year-old woman with age-related cataract had an uneventful phacoemulsification and a Tecnis ZM900 multifocal intraocular lens (IOL) implantation in both eyes. During IOL implantation in the left eye, the optic was unintentionally reversed in the bag and left that way. The refraction surprise was not significant and six months postoperatively the corrected distance visual acuity in both eye...