Through focus point spread function and modulus transfer function of intraocular lenses

Paige Sawyers; Jim Schwiegerling; Dongkyun Kang; Travis Sawyer

doi:10.1117/12.2692798

13 March 2024 Through focus point spread function and modulus transfer function of intraocular lenses

Paige Sawyers, Jim Schwiegerling, Dongkyun Kang, Travis Sawyer

Proceedings Volume PC12824, Ophthalmic Technologies XXXIV; PC1282418 (2024) https://doi.org/10.1117/12.2692798
Event: SPIE BiOS, 2024, San Francisco, California, United States

Conference Poster

Abstract

We developed and tested a system for measuring the through-focus point spread function (PSF) for IOLs and converting it to the modulation transfer function (MTF). The system consists of a light source, eye model, a test IOL, a 10X magnifier, and a 16-bit CCD camera. By capturing the image of the IOL through a range of focus positions, the PSF can be found and then converted to MTF. Unlike basic monofocal lenses, multifocal IOLs can focus at two or more positions, while extended depth of field (EDOF) IOLs lenses provide a continuum of foci. These advanced IOLs are beneficial as they more closely resemble the natural range of focus of the eye. The modulation transfer function (MTF) is a standard approach for IOL characterization, but existing MTF measurement methodology is not optimized for multifocal or EDOF IOLs. As IOLs continue to evolve, using the MTF to predict image quality is vital to implanting the most appropriate lens in the patient’s eyes.

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Paige Sawyers, Jim Schwiegerling, Dongkyun Kang, and Travis Sawyer "Through focus point spread function and modulus transfer function of intraocular lenses", Proc. SPIE PC12824, Ophthalmic Technologies XXXIV, PC1282418 (13 March 2024); https://doi.org/10.1117/12.2692798

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