Modulation transfer function and contrast sensitivity of refractive multi-zone multi-focal lenses

Contrast imaging of new multifocal intraocular lens (MIOL) designs with 5 and 7 refractive zones was examined by in vitro measurement of the modulation transfer function (MTF) and by testing contrast sensitivity with Regan 96% and 11% contrast sensitivity charts after "optical implantation"...

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Bibliographic Details
Published inDer Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft Vol. 90; no. 4; p. 343
Main Authors Eisenmann, D, Hessemer, V, Manzke, B, Stork, W, Jacobi, K W
Format Journal Article
LanguageGerman
Published Germany 01.08.1993
Subjects
Contrast Sensitivity
Humans
Lenses, Intraocular
Optical Devices
Optics and Photonics
Prosthesis Design
Refraction, Ocular
Signal Processing, Computer-Assisted
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ISSN0941-293X

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Summary:Contrast imaging of new multifocal intraocular lens (MIOL) designs with 5 and 7 refractive zones was examined by in vitro measurement of the modulation transfer function (MTF) and by testing contrast sensitivity with Regan 96% and 11% contrast sensitivity charts after "optical implantation" of MIOLs in 20 healthy subjects by means of a new optical device developed by Reiner. The results were compared with those obtained with a monofocal IOL and a diffractive MIOL. We found that the MTF of both refractive MIOLs showed a reduction in contrast at corresponding spatial frequencies compared with the monofocal and with the diffractive IOL, resulting in a Strehl ratio of below 30%. Contrast sensitivity after "optical implantation" was significantly reduced for the refractive 5- and 7-zone models in high contrast (Regan 96%), but for all MIOL models in low contrast (Regan 11%) compared with the monofocal IOL. The refractive 5-zone MIOL and diffractive MIOL showed no statistical difference in contrast sensitivity.
ISSN:0941-293X