Retinal illuminance using a wide-angle model of the eye

Area of Science:

• Ophthalmology and Vision Science
• Optical Engineering
• Biomedical Modeling

Background:

• Accurate modeling of retinal illuminance is essential for understanding visual perception and optical performance of the eye.
• Previous models often lacked accuracy in peripheral vision and with large pupil sizes, limiting their applicability.
• In vivo measurements of ocular aberrations, particularly spherical aberration, are critical for refining optical models.

Purpose of the Study:

• To develop and validate a computer model for relative retinal illuminance.
• To accurately represent anatomical eye parameters and correct for peripheral field and large pupil effects.
• To analyze illuminance under Ganzfeld and Maxwellian viewing conditions across a wide visual field (0-80 degrees).

Main Methods:

• Developed a wide-angle optical model of the eye incorporating previously measured in vivo spherical aberration data from 100 eyes.
• Simulated retinal illuminance for pupil diameters of 2, 4, and 8 mm.
• Estimated the effect of crystalline lens extinction in young and old eyes at 410 nm and 532 nm wavelengths.

Main Results:

• The model demonstrates functional correctness and close anatomical representation.
• In the Ganzfeld condition, retinal illumination decreases as the visual angle increases.
• In the Maxwellian view condition, retinal illuminance increases with increasing visual angle.

Conclusions:

• The proposed computer model provides a more accurate prediction of relative retinal illuminance, especially in peripheral vision and with large pupils.
• The model's findings on illuminance changes with visual angle under different viewing conditions have implications for visual optics research.
• Understanding lens extinction effects provides insights into age-related changes in retinal illumination.