9 December 2004 Phase modulators for refractive corrections of human eyes
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Abstract
This research project investigates the specifications of phase modulators for the treatment of presbyopia (accommodation loss). Correction of presbyopia is simulated using a pixilated phase modulator directly in front of a human eye model. The results show that maximal phase modulation depth of 17.5l (550nm) is required for a 2 Diopter change in a 6 mm pupil. The same phase retardation provides 7 Diopters of correction for a 3 mm pupil as opposed to 1.2 Diopters for 8 mm pupil. The impact of diffraction due to pixelation of the phase array on image quality is measured using encircled energy, where a well-focused point is defined as having 75% of its energy within a 15 mm radius. For a 2 Diopter correction in a 6 mm pupil, pixelation effects are important at low pixel density and decrease asymptotically with increasing density, stabilizing at about 51 x 51 pixels. In smaller pupils, the equivalent optical correction requires less pixel density to provide equal image quality. In conclusion, a phase modulator with a maximal phase change of 17.5l and 64 x 64 pixels could provide up to 2 Diopters of accommodation in a 6 mm pupil and significantly more in a smaller pupil, thus providing an excellent correction.
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Rejean Munger, Linda E. Marchese, Lijan Hou, "Phase modulators for refractive corrections of human eyes", Proc. SPIE 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education, (9 December 2004); doi: 10.1117/12.567605; https://doi.org/10.1117/12.567605
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KEYWORDS
Spatial light modulators

Eye

Point spread functions

Diffraction

Eye models

Optical calibration

Optical components

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