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.
A system for measuring the through-focus point spread function (PSF) for intra-ocular lenses (IOLs) and converting to modulation transfer function (MTF) is developed. The system consists of a light source, eye model, IOL, magnifier, and CCD camera. By capturing the resulting image through a range of focus positions, the PSF is found and converted to MTF. The MTF displays differences in the depth of focus for monofocal, multifocal, and extended depth of focus (EDOF) IOLs. As multifocal and EDOF IOLs evolve, using the MTF to predict the image quality is vital to implanting the most appropriate lens in the patient’s eyes.
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