Abstract
The paper analyzes the imaging properties of the light sword optical element (LSOE) applied as a contact lens to the presbyopic human eye. We performed our studies with a human eye model based on the Gullstrand parameterization. In order to quantify the discussion concerning imaging with extended depth of focus, we introduced quantitative parameters characterizing output images of optotypes obtained in numerical simulations. The quality of the images formed by the LSOE were compared with those created by a presbyopic human eye, reading glasses and a quartic inverse axicon. Then we complemented the numerical results by an experiment where a 3D scene was imaged by means of the refractive LSOE correcting an artificial eye based on the Gullstrand model. According to performed simulations and experiments the LSOE exhibits abilities for presbyopia correction in a wide range of functional vision distances.
Highlights
Simulations were performed versus a naked presbyopic eye (EYE) and an EYE corrected with an light sword optical element (LSOE) contact lens, monofocal reading glasses (RG) and an inverse quartic axicon (IQAX)
The last two elements (IQAX, LSOE) compensate EYE shown in Fig. 1 and they are designed in order to cover defocus from 0 D up to +4 D corresponding to the object distances range 25cm
These three cases correspond to EYE, RG and LSOE in the presented numerical simulations
Summary
At birth the human eye has outstanding abilities to change its optical power by accomodation. We decided to investigate in detail the quality of imaging realized by the LSOE in a set-up simulating a presbyopic naked eye. Simulations were performed versus a naked presbyopic eye (EYE) and an EYE corrected with an LSOE contact lens, monofocal reading glasses (RG) and an inverse quartic axicon (IQAX). A spatial scene was imaged by the setup corresponding to a naked eye and by the same setup corrected with a refractive LSOE and a refractive monofocal lens simulating reading glasses. Both corrective elements were fabricated by photosculpture in OrmocerTM photoresist using grayscale masks [11]
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