Abstract
We first investigated the similarity in optical quality of a batch of diffractive intraocular lenses (DIOLs), providing experimental evidence for one DIOL as representative of a batch. Using adaptive optics, we then evaluated one DIOL under different levels of Zernike spherical aberration (SA) by applying both a point spread function test and a psychophysical visual acuity test. We found that for small aperture size SA has the effect of shifting the through-focus curve of DIOL. Also, for a relatively large aperture size, it has different effects on the distant and near foci.
Highlights
With a passive mechanism for the treatment of presbyopia, diffractive intraocular lenses (DIOLs) are designed for the restoration of accommodation by creating multiple foci
We investigated the effect of spherical aberration (SA) on a single DIOL with adaptive optics, applying both objective and subjective methods
The through-focus point spread function (PSF) were recorded by translating the CCD backward/forward covering −0.4 to 0.4 mm with a 0.1 mm step, and the PSFs were recorded at three decentrations by shifting the DIOL to right, left and down each by 0.5 mm
Summary
With a passive mechanism for the treatment of presbyopia, diffractive intraocular lenses (DIOLs) are designed for the restoration of accommodation by creating multiple foci. DIOLs have been studied by many authors in aspects of design, evaluation, and clinical implantation.[2,3,4,5] Clinically an implanted DIOL usually provides no improvement, or slightly worse visual quality for a distant object but significantly better quality for the near objects compared with a monofocal IOL. Despite many variations in the pseudophakic eye’s biometry and physiological parameters, the aspheric monofocal IOL still performs better than a spherical IOL.[9] For an aspheric DIOL, a theoretical simulation paper claimed that for large populations there is small percentage improvement if the DIOL has add-on of −0.1 μm SA (6 mm).[10]
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