Customized models of ocular aberrations across the visual field during accommodation.

Area of Science:

• Ophthalmic Optics
• Computational Vision
• Biomedical Engineering

Background:

• Accurate modeling of ocular aberrations is crucial for understanding visual function.
• Accommodation significantly alters the eye's optical aberrations, impacting image quality.
• Previous models lacked precision in replicating individual variations in accommodative aberrations.

Purpose of the Study:

• To create individualized eye models that accurately predict wave-front aberrations across the visual field at varying accommodative states.
• To provide a mechanistic explanation for how accommodation influences the eye's aberration structure.
• To assess the impact of accommodative lag on retinal image quality and photoreceptor response.

Main Methods:

• Optimized structural parameters of a generic eye model using optical design software.
• Incorporated biometric data from 19 individuals and normative data for anatomical constraints.
• Validated models against empirical measurements of wave-front aberrations across the central 30° visual field at eight accommodative levels.

Main Results:

• Customized accommodating eye models achieved high accuracy, with root mean square fitting errors typically below 0.2 μm.
• Optimized model parameters were anatomically reasonable and exhibited expected changes during accommodation.
• Relaxing lens constraints improved spherical aberration accuracy, compensating for the absence of gradient-index media.
• Computed pan-retinal image quality revealed significant penalties from accommodative lag on photoreceptor activation.

Conclusions:

• Individualized eye models can accurately replicate accommodative wave-front aberrations.
• These models provide valuable insights into the mechanisms underlying accommodation-induced changes in ocular aberrations.
• The findings highlight the detrimental effect of accommodative lag on visual performance and emphasize the need for accurate focusing.