3 research outputs found
The evaluation of spectral transmittance of optical eye-lenses
In the present study, the effect of light on mineral (Quartz) and
organic lenses (Diethylene glycol bis (allyl carbonate)-CR39,
polycarbonate, trivex) is briefly reported. It is essential to choose
the right conditions for ophthalmic lenses, such as the lighting
environment in order to maintain the eye health.
In this article, to discuss the harmful effects of ultraviolet radiation
(UVR) on the lenses and to analyze the results of the visible-light
transmittance, the properties of mineral and organic eye-lenses are
investigated considering the personal eye-protections, ophthalmic
optics, the transmittance requirements standards of scientific
researches and the literature studies, by use of coated and uncoated
prescriptive ophthalmic plastic concave and convex lenses.
A UV-vis spectrophotometer device is used to determine the spectral
transmittance of lenses in different diopters, index numbers and coating
characteristics. Additionally, the physical and optical characteristics
of eye-lenses, as well as their chemical characteristics and molecular
structures are studied in this article. Also, the vibrational
frequencies of organic lenses are investigated applying FT-IR device
measurements, and the optimized molecular structure of CR-39 monomer by
density functional theory (DFT) quantum chemical method is explained
using B3LYP method with STO-3G and 6-31G as basis set. (C) 2015 Elsevier
GmbH. All rights reserved