A Rapid and Convenient Procedure to Evaluate Optical Performance of Intraocular LensesReport as inadecuate




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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.



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





Author: Frank Schaeffel 1,* and Hakan Kaymak 2

Source: http://mdpi.com/



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