Accommodation and age-dependent eye model based on in vivo measurements

Area of Science:

• Ophthalmology
• Optical Engineering
• Biomedical Modeling

Background:

• Accurate eye models are crucial for understanding visual optics.
• Previous models often lack flexibility in incorporating age-related and accommodative changes.
• Environmental factors like pupil diameter influence optical parameters.

Purpose of the Study:

• To create a dynamic eye model accounting for age and accommodation.
• To integrate changes in all optical parameters, including entrance pupil diameter.
• To simulate photopic, natural environmental conditions.

Main Methods:

• Utilized retrospective in vivo measurements of optical parameters.
• Employed ray-tracing to compute wavefront aberrations based on age, vergence, and pupil size.
• Calculated objective refraction and accommodation response/stimulus curves.

Main Results:

• Predicted a +0.22D hyperopic shift per decade due to aging (20-65 years).
• Accommodation response/stimulus slope was 0.72 at age 25, stable until 45.
• Model showed age-dependent spherical aberration changes and entrance pupil diameter variations.

Conclusions:

• The developed eye model accurately predicts refractive and accommodative changes.
• It serves as a valuable tool for designing and testing ophthalmic devices.
• Potential applications include intraocular and contact lens development for optical error correction.