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Photonics 2014, 1(3), 267-282; doi:10.3390/photonics1030267

A Rapid and Convenient Procedure to Evaluate Optical Performance of Intraocular Lenses

1
Ophthalmic Research Institute, Section of Neurobiology of the Eye, Calwerstrasse 7/1, 72076 Tübingen, Germany
2
Praxisklinik Premium Eyes Düsseldorf Zentrum für Refraktive Chirurgie, Berliner Allee 15, 40212 Düsseldorf, Germany
*
Author to whom correspondence should be addressed.
Received: 24 August 2014 / Revised: 14 September 2014 / Accepted: 14 September 2014 / Published: 18 September 2014
(This article belongs to the Special Issue Optics and Technologies for Ophthalmology and Visual Science)
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Abstract

A new portable lens scanner was developed and tested for measuring focal lengths and relative contrast transfer of mono- and multifocal intraocular lenses (IOLs). A photograph of a natural scene was imaged in white light through an IOL in a water-filled cuvette, with their +21D base power largely neutralized by a −20D trial lens, using a USB monochrome video camera that could be focused via a laptop-controlled stepping motor from −8.5 to + 8.0D. The output of 10000 ON-OFF antagonistic “receptive fields” measuring the video image with adjustable diameter was continuously recorded by custom written software to quantify focus and relative contrast. Six monofocal and four multifocal IOLs, as well as two radial refractive gradient (RRG) lenses were measured. After calibration with trial lenses the optical powers and relative contrast transfer of mono- and multifocal IOLs were readily measured. Refractive power profiles measured in RRG lenses closely matched data obtained from the manufacturer. The lens scanner uses a rapidly operating procedure, is portable and can be used to verify positions of the focal planes of mono- and multifocal IOLs in less than 3 s. View Full-Text
Keywords: intraocular lenses; contrast transfer; digital image processing; focus intraocular lenses; contrast transfer; digital image processing; focus
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Schaeffel, F.; Kaymak, H. A Rapid and Convenient Procedure to Evaluate Optical Performance of Intraocular Lenses. Photonics 2014, 1, 267-282.

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