Accommodation-dependent model of the human eye with aspherics

Area of Science:

• Ophthalmology
• Optical Engineering
• Biomedical Optics

Background:

• The human eye's optical performance is complex, influenced by corneal and lens aberrations.
• Existing models like Gullstrand-Le Grand provide a basis but require refinement for accurate aberration prediction.

Purpose of the Study:

• To develop a schematic human eye model that accurately predicts optical aberrations, including spherical and chromatic aberration.
• To investigate the eye's optical performance during accommodation using a refined model.

Main Methods:

• Incorporated experimental average measurements of the cornea and lens into the Gullstrand-Le Grand schematic eye model.
• Adjusted chromatic dispersions to match experimentally observed chromatic aberration.
• Calculated polychromatic point-spread function and modulation transfer function for various pupil sizes.
• Developed an accommodation-dependent model incorporating asphericity variations.

Main Results:

• The refined model accurately predicted average spherical aberration without shape fitting.
• Calculated optical performance metrics (PSF, MTF) showed good agreement with experimental data.
• The accommodation model successfully reproduced the increase in refractive power during accommodation.

Conclusions:

• The proposed schematic eye model provides a robust framework for understanding human eye optics and aberrations.
• The model's ability to predict accommodative changes offers insights into dynamic visual function.
• This approach advances the simulation of ocular optics for research and potential clinical applications.