Results 231 to 240 of about 308,967 (294)

Lens thickness and associated factors

Clinical & Experimental Ophthalmology, 2012
AbstractBackground:  To determine the normative data for lens thickness and its associated factors in a population‐based study.Design:  Population‐based study.Participants:  The Central India Eye and Medical Study included 4711 subjects (aged 30+ years).Methods:  The subjects underwent a detailed ophthalmological examination including measurement of ...
Jost B, Jonas   +4 more
openaire   +4 more sources

Replacing a thin lens by a thick lens

Applied Optics, 2020
This paper deals with the problem of replacing a thin lens by a thick lens with approximately the same properties as the thin lens. Equations enabling the calculation of the parameters of a thick lens that has the same focal length and the same value for one of the Seidel aberration coefficients (either the Seidel aberration coefficient of spherical ...
Antonín, Mikš, Pavel, Novák
openaire   +2 more sources

Aberration design of zoom lens systems using thick lens modules

Applied Optics, 2014
A systematic approach for the aberration design of a zoom lens system using a thick lens module is presented. Each component is treated as a thick lens module at the beginning of the design. A thick lens module refers to a thick lens component with a real lens structure, like lens materials, lens curvatures, lens thicknesses, and lens interval ...
Jinkai, Zhang   +3 more
openaire   +2 more sources

Corneal Thickness Measurements Following Intraocular Lens Implantation

Ophthalmic Surgery, Lasers and Imaging Retina, 1977
SUMMARY Corneal thickness measurements were carried out on patients who had undergone combined phacoemulsification cataract extraction with simultaneous intraocular lens implantation in one eye at least six months prior to the date of measurement. The unoperated eye served as control.
D L, Praeger, H A, Schneider
openaire   +2 more sources

Understanding lens thickness

Optician, 2016
Andy Sanders takes a look at lens thickness and what should be borne in mind to offer our patients the best appearance and wearing comfort when dispensing any particular refractive correction.
openaire   +1 more source

Accuracy of New Intraocular Lens Power Calculation Formulas: A Lens Thickness Study

Journal of Refractive Surgery, 2021
PURPOSE: To investigate whether using lens thickness measurement as an optional input improves the refractive accuracy of four new generation formulas. METHODS: Consecutive patients scheduled for cataract surgery were enrolled.
Leonardo, Taroni   +4 more
openaire   +2 more sources

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