A biometry-based human eye model was developed by using the empirical anatomic and optical data of ocular parameters. The gradient refractive index of the crystalline lens was modeled by concentric conicoid isoindical surfaces and was adaptive to accommodation and age. The chromatic dispersion of ocular media was described by Cauchy equations. The intraocular scattering model was composed of volumetric Mie scattering in the cornea and the crystalline lens, and a diffusive-surface model at the retina fundus. The retina was regarded as a Lambertian surface and was assigned its corresponding reflectance at each wavelength. The optical performance of the eye model was evaluated in CodeV and ASAP and presented by the modulation transfer functions at single and multiple wavelengths. The chromatic optical powers obtained from this model resembled that of the average physiological eyes. The scattering property was assessed by means of glare veiling luminance and compared with the CIE general disability glare equation. By replacing the transparent lens with a cataractous lens, the disability glare curve of cataracts was generated to compare with the normal disability glare curve. This model has high potential for investigating visual performance in ordinary lighting and display conditions and under the influence of glare sources.
An intraocular scattering model was constructed in human eye model and experimentally verified. According to the
biometric data, the volumetric scattering in crystalline lens and diffusion at retina fundus were developed. The scattering
parameters of cornea, including particle size and obscuration ratio, were varied to make the veiling luminance of the eye
model matching the CIE disability glare general formula. By replacing the transparent lens with a cataractous lens, the
disability glare curve of cataracts was generated and compared with that of transparent lenses. The MTF of the
intraocular scattering model showed nice correspondence with the data measured by a double-pass experiment.
A biometry-based human eye model was developed by using the empirical anatomic and optical data of ocular
parameters. The gradient refractive index of the crystalline lens was modeled by concentric conicoid isoindical surfaces
and was adaptive to accommodation and age. The chromatic dispersion of homogeneous ocular media was described
by Cauchy equations. The gradient equations for the refractive index of crystalline lens were modified at particular
wavelengths according to the same dispersion model. Mie scattering was introduced to simulate volumetric light
scattering in the crystalline lens.
The optical performance of the eye model was evaluated in CodeV and ASAP and presented by the modulation transfer
function (MTF) at single and multiple wavelengths. The chromatic optical powers obtained from this model matched
that of physiological eyes. The scattering property was assessed by means of glare veiling luminance and compared
with CIE general disability glare equation. This model is highly potential for investigating visual performance in
ordinary lighting and display conditions and under the influence of glare sources.
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