Phase modulators for refractive corrections of human eyes

Rejean Munger; Linda E. Marchese; Lijan Hou

doi:10.1117/12.567605

9 December 2004 Phase modulators for refractive corrections of human eyes

Rejean Munger, Linda E. Marchese, Lijan Hou

Proceedings Volume 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education; (2004) https://doi.org/10.1117/12.567605
Event: Photonics North, 2004, Ottawa, Ontario, Canada

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.

Citation Download Citation

Rejean Munger, Linda E. Marchese, and 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); 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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