Abstract
Fast tunable lenses allow an effective design of a portable simultaneous vision simulator (SimVis) of multifocal corrections. A novel method of evaluating the temporal profile of a tunable lens in simulating different multifocal intraocular lenses (M-IOLs) is presented. The proposed method involves the characteristic fitting of the through-focus (TF) optical quality of the multifocal component of a given M-IOL to a linear combination of TF optical quality of monofocal lenses viable with a tunable lens. Three different types of M-IOL designs are tested, namely: segmented refractive, diffractive and refractive extended depth of focus. The metric used for the optical evaluation of the temporal profile is the visual Strehl (VS) ratio. It is shown that the time profiles generated with the VS ratio as a metric in SimVis resulted in TF VS ratio and TF simulated images that closely matched the TF VS ratio and TF simulated images predicted with the M-IOL. The effects of temporal sampling, varying pupil size, monochromatic aberrations, longitudinal chromatic aberrations and temporal dynamics on SimVis are discussed.
Highlights
Presbyopia is the loss of good near vision that affects middle and old-aged population
The simultaneous vision simulator (SimVis) time coefficients corresponding to the Multifocal intraocular lenses (M-IOLs) were obtained by using Eq (3)
The TF optical quality of SimVis for each M-IOL with the chosen sampling is estimated from the integrated TF point spread functions (PSFs) weighted with the time coefficients
Summary
Presbyopia is the loss of good near vision that affects middle and old-aged population. Simultaneous vision can be provided in the form of several multifocal solutions (contact lenses, intraocular lenses or corneal treatment) for presbyopia correction [1]. Multifocal intraocular lenses (M-IOLs) provide concurrent vision in focus at two or more distances. M-IOL replaces the crystalline lens in a cataract surgery providing the patient with good vision at near and far distances (besides adequate intermediate vision with certain M-IOLs). It can be difficult for a surgeon to describe the visual benefit and possible visual outcomes of the surgery to a patient when a specific M-IOL is implanted. An instrument that provides the visual experience of simultaneous vision to the patient before the surgery can be useful
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