Optical simulation in the human retina for cataract eye using scattering theory and geometric optics Monte Carlo method

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  • 散乱理論と幾何光学的モンテカルロ法を用いた白内障眼の網膜における放射照度シミュレーション

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Abstract

<p>We evaluated the light scattering from crystalline lenses of cataract using geometric optics Monte Carlo method. We used Gullstrand model eye that includes cataract particles in the nucleus of the lenses and calculate irradiance distribution in the retina for multiple incident wavelengths. Diameter, refractive index, and particle density reported in previous studies are used as those of the cataract particles. For the calculation, refractive index of the particles is 1.5; particle diameters are 1.0 μm and 2.0 μm; the particle density are 500, 4,000, 100,000 /mm3; the incident wavelengths are 400, 600, 800, 1000 nm. As the particle density and diameter becomes larger, the maximum intensity of the point image on the retina decreases, but the spread of the point image on the retina is the almost same as the case where the lens includes no particle. The simulated result indicates that the scattered light spreads wider than the point image and does not affect the spread of the point image. The maximum intensity decreases slightly for long wavelength. The wavelength dependence becomes significant for large diameter and high density of the particles.</p>

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