Abstract
We present and test a methodology for generating simultaneous vision with a deformable mirror that changed shape at 50 Hz between two vergences: 0 D (far vision) and -2.5 D (near vision). Different bifocal designs, including toric and combinations of spherical aberration, were simulated and assessed objectively. We found that typical corneal aberrations of a 60-year-old subject changes the shape of objective through-focus curves of a perfect bifocal lens. This methodology can be used to investigate subjective visual performance for different multifocal contact or intraocular lens designs.
Highlights
Accommodation is an important mechanism of the young eye to bring nearby objects into focus and creating sharp and clear images at the retina
Theoretical curves were not included for the cross-correlation values, since they are less sensitive to a contrast reduction caused by a secondary, out-of-focus image
We propose a method based on temporal multiplexing simultaneous vision to simulate the visual optical effects of multifocal designs using AO technology
Summary
Accommodation is an important mechanism of the young eye to bring nearby objects into focus and creating sharp and clear images at the retina. Each projected image corresponds to a sharp image at a different vergence This solution is achieved by multifocal CLs [1,5] or IOLs with refractive [4] or diffractive [4,6] profiles. Success of simultaneous vision relies on the ability of the human brain to select among the superimposed images a primary in-focus image [1], suppressing the blurred out-of-focus image. The drawback of this strategy is that suppression ability varies among individuals [7]; the out-of focus images, if not suppressed, can generate a great amount of blur and reduce the contrast sensitivity [1,4,8]. Large depth-of-focus (DoF) achieved by using a pinhole in a contact lens [9], in a corneal inlay [10] or near the pupil plane [11], allows for simultaneous vision
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