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Difference in optical properties between trifocal, multifocal and extended-range-of-vision lenses

Poster Details

First Author: H.Weeber THE NETHERLANDS

Co Author(s):    C. Canovas   A. Alarcon   D. Chang   P. Piers           

Abstract Details

Purpose:

While many studies present optical properties of IOLs, the outcomes of these studies vary considerably, as a result of having different test conditions and metrics used. The purpose of this study was to evaluate the optical properties of trifocal, multifocal and extended range of vision (ERV) lenses when tested in clinically relevant eye models and conditions.

Setting:

AMO Groningen b.v., Groningen, Netherlands

Methods:

Trifocal, multifocal and ERV lenses were tested. For comparison, two sets of conditions were used. Firstly, Modulation transfer function (MTF) was measured in green light following the ISO standard for multifocal IOLs. Secondly, the area under the MTF curve was measured in white light in an eye model that is contains representative amounts of spherical and chromatic aberration. The outcomes of these two sets of data were compared with each other, and with known clinical behavior.

Results:

The ISO standard for multifocal IOLs leaves room for testing with various pupil sizes and spatial frequencies. Using the ISO standard, all lens models showed a bimodal behavior, for specific measurement conditions. Generally, the test results did not correlate, or poorly correlated with known clinical behavior. When measuring the area-under-the-MTF defocus curve, in white light and in an eye model that contains representative amounts of spherical and chromatic aberration, all bifocal and trifocal lens designs exhibited a bimodal behavior, while the ERV design showed a continuous range of high optical performance for far and intermediate distances.

Conclusions:

Measurement outcomes are highly influenced by the test conditions. Measurements following the ISO standard do not correlate well with clinical behavior. Measurements of the area-under-the-MTF defocus curve, in eye models that include spherical and chromatic aberration confirm the differences seen in a clinical environment between trifocal, multifocal and ERV lenses.

Financial Disclosure:

is employed by a for-profit company with an interest in the subject of the presentation, receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented

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