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Y. Hirohara, M. Saika, T. Fujikado, T. Oshika, T. Mihashi; Wavefront Aberrations and Modulation Transfer Functions of Multifocal Intraocular Lenses in Visible and Infrared Wavelengths. Invest. Ophthalmol. Vis. Sci. 2010;51(13):3962.
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© ARVO (1962-2015); The Authors (2016-present)
We measured three types of IOLs using a two-wavelength Shack-Hartmann wavefront aberrometer (SHWA) and modulation transfer function (MTF) equipment and investigated the validity of a wavefront aberration (WA) measurement of multifocal IOLs.
A monofocal IOL (Sensar AR40e AMO), a refractive multifocal IOL (ReZoom NXG1 AMO), and an apodized diffractive multifocal IOL (AcrySof Restor SA60D3 Alcon) were measured. We developed an aberration-free artificial eye (AFAE) which could hold an IOL to measure its aberration and MTF in the water. Wavefront sensing (WS) was performed on the AFAE with each IOL using a two-wavelength (561nm and 840nm) SHWA. Through focus MTF (TF-MTF) of the AFAE with the IOLs were also measured using a TF-MTF measurement system (MATRIX PLUS Nanotex corp.) in visible and near infrared (NIR) wavelengths.
RMS of the WAs of the AR40e was 0.01µm for the 4-mm circle area and 0.06µm for the 6-mm circular area. Spatial pattern of Hartmann image of the NXG1 was distorted and the distortion was rotationally symmetrical because the IOL had five annular power zones. TF-MTF calculated from the WAs had peaks at two defocus positions. PSFs in the Hartmann image of the AFAE with SA60D3 were blurred a little with 840-nm WS but some PSFs were split into two spots with 561-nm WS. We could calculate distant or near refraction selecting one of those split PSFs. TF-MTF of the AR40e had a peak only at one focus position, but that of NXG1 had peaks at two defocus positions in both wavelengths. TF-MTF of the SA60D3 had peaks at two defocus positions in 561nm, but one peak in 840nm.
We could evaluate multifocality of the diffractive multifocal IOL using the visible wavelength. We also confirmed that wavefront sensing of a diffractive multifocal IOL with an infrared wavelength is valid to measure distance vision.
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