OBJECTIVES The impact of wearing lenses on visual and musculoskeletal complaints in VDU workers is currently unknown. The goal of this study was 1) to evaluate the impact of wearing VDU lenses on visual fatigue and self-reported neck pain and disability, compared to progressive lenses, and 2) to measure the effect of both lenses on head inclination and pressure pain thresholds during the perfor...

Lenses from young rhesus monkeys were incubated in the presence of H2O2 or oxygen radical generating systems to determine their suitability as a model for investigating lenticular oxidative stress. Additionally, direct comparisons were made between the effects found with the monkey lenses and those observed with cultured rat lenses exposed to the same oxidizing systems. As in earlier studies wi...

During the last years, cataract surgery has taken a refractive tendency, especially since the appearance of artificial crystalline lenses, which give multifocality, asphericity, and toricity. This trend has given birth to the term of „refractive cataract surgery”. The refractive cataract surgery may be defined as the surgery of cataract with a double purpose: to improve vision and the reduce sp...

PURPOSE The visual performance of monofocal, bifocal, and trifocal intraocular lenses was evaluated by human individuals using a vision simulator device. This allowed investigation of the visual impression after cataract surgery, without the need actually to implant the lenses. METHODS The randomized, double-masked, three-way cross-over study was conducted on 60 healthy male and female subjec...

We describe a wink-controlled hands-free switching system for eye-borne telescopic vision, based on a previously tested fixed-magnification telescope embedded within scleral contact lenses. Here we integrate orthogonal polarizers into the contact lens covering the F/9.1 refractive 1× and F/9.6 catadioptric 2.8× vision paths, to allow switching via external liquid crystal shutters. We provide ha...

This paper presents an innovative Concentrating Glazing system to be adopted in smart building façades: The Photovoltaic (CoPVG). device consists of a double-glazing panel integrating series concentrating lenses. A thin layer PV cells is then placed at the lenses' focus. peculiar lens design can produce, by using Total Internal Reflection (TIR), seasonal effect with more light entering low inci...

Purpose Cx46fs380 mice model a human autosomal-dominant cataract caused by a mutant lens connexin46, Cx46. Lenses from Cx46fs380 mice develop cataracts that are first observed at ∼2 months in homozygotes and at ≥4 months in heterozygotes. The present studies were conducted to determine whether Cx46fs380 mouse lenses exhibited abnormalities before there are detectable cataracts. Methods Lenses...

Background: Blindness due to cataract is a major and important problem in Pakistan. The problem is expected to increase in future due to increase in tobacco smoking. The aim of study was to look for the mechanism associated with metal deposition and its effect on antioxidant enzymes in lens of smokers in Karachi, Pakistan. Methods: 20 cataract patients were randomly selected from Out Patient De...

Common bean (Phaseolus vulgaris L.) genotype Flamingo was inoculated with Rhizobium tropici CIAT899 and Glomus intraradices by mycorrhizal inoculant or by contact with mycorrhized Stylosanthes guianensis and grown under sufficient versus deficient phosphorus supply after transfer from initial sand culture, for comparing the effects of double inoculation (by contact or by inoculant) on growth, n...

Background: Sand production is an important factor affecting reservoir exploitation. Excessive sand production affects the oil well life, causes the damage to the oil recovery device and brings serious hidden danger in the process of safety production. Objective: This paper presents a sand content computation model for the crude oil, which uses the power of sand production and Parseval theorem,...