OBJECTIVE To evaluate the refractive outcomes of 3-port lens-sparing vitrectomy (LSV) for subtotal retinal detachments owing to retinopathy of prematurity. METHODS The study included 9 infants who had undergone complete ablative laser treatment for threshold retinopathy of prematurity in both eyes, subsequently developed stage 4A retinal detachment in 1 eye for which they underwent LSV, and m...

PURPOSE To explore the relationship between lens power and refractive error in older adults following age-related hyperopic shifts. METHODS From the Shahroud Eye Cohort Study, subjects aged 55-64 years without clinically significant cataracts (with nuclear opacity of grade 0 to 1) were included to maximize the proportion of subjects with age-related hyperopic shifts that normally occur betwee...

In the present study, the lenses and ciliary bodies of 20 ostrich eyes were studied macroscopically and microscopically. The histological slides were studied after staining by hematoxylin and eosin, Verhoeff, Van Gieson, and periodic acid-Schiff (PAS). Posterior surface of lens was more convex than its anterior surface. The average lens diameter and thickness were respectively measured as 1.43 ...

The relationship between corneal edema and hydrogel lens oxygen transmissibility was examined for both daily and extended contact lens wear by measuring the corneal swelling response induced by a variety of contact lenses over a 36-hr wearing period. The relationships derived enable average edema levels that occur with daily and extended wear in a population of normal young adults to be predict...

A stable anterior chamber is a crucial factor to DSAEK. In aniridic patients with BDI lens, the anterior and posterior segment has direct communication at the periphery of the BDI lens. Maintenance of the air bubble in the anterior chamber would be problematic. Pressure equilibrium must be established on both sides of the BDI lens before the air bubble is introduced into the anterior chamber. C...

Recent theoretical work suggested the possibility of constructing a super-resolution diffraction-free lens by using a negative refractive index medium ~NRIM!. The key proposition is that evanescent waves can be greatly enhanced by increasing the thickness of the NRIM. We report here experimental evidence that confirms that the transmission of evanescent waves rapidly grows with the film thickne...

Lens flexure and residual astigmatism were evaluated with rigid gas permeable (RGP) contact lenses made in low, medium, and high oxygen permeable (Dk) materials to determine if significant differences would be apparent as lens Dk was changed. Fourteen successful RGP contact lens wearers had their customary lens parameters, including lens thickness, held constant in duplicate pairs made in low (...

OBJECTIVES To determine if a plano lens could be the test lens for all prescription (Rx) lenses and to investigate why Rx lenses pop out of safety eyewear. DESIGN Plano and Rx polycarbonate lenses (n = 641) with varying thickness and edge geometry, mounted on steel lens holders, and Rx safety eyewear (n = 128) placed on headforms were impacted with test objects of varying diameter and hardnes...

in this study, genital tracts of 20 healthy non-pregnant buffaloes were collected from urmia abattoir.these genital tracts were selected based on their ovaries conditions, half of them were in follicular phase and the other half were in luteal phase. the samples were taken from anterior, middle and posterior regions of the cervix and fixed in 10% buffer formalin. then, histological sections of ...

Recent papers have presented correlations between the radius of curvature of the anterior lens surface and anterior chamber depth (Lowe, I972), and between the anterior lens radius and the anterior and posterior corneal radius (Lowe and Clark, I973). This paper presents measurements of anterior lens radius in relation to age, lens thickness, and axial length in two series comprising 9I normal e...