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Accommodating version of a schematic eye for emmetropia and myopia
David A Atchison1, W Neil Charman2
1Centre for Vision and Eye Research, Queensland University of Technology, Kelvin Grove, Queensland, Australia.
Summary
A new wide-angle schematic eye model incorporates spectacle refraction and accommodation, aiding in predicting retinal image quality for emmetropia and myopia. This advanced model offers insights into visual optics.
Area of Science:
- Ophthalmology
- Optical Engineering
- Visual Science
Background:
- Existing schematic eye models often lack the ability to incorporate both refractive error and accommodation as dynamic parameters.
- Understanding how these factors influence retinal image quality is crucial for diagnosing and correcting vision disorders.
Purpose of the Study:
- To develop an accommodating, wide-angle, schematic eye model.
- To enable spectacle refraction and accommodation level as input parameters for emmetropia and myopia.
Main Methods:
- Adapted an existing unaccommodated schematic eye model with a gradient index lens.
- Incorporated accommodation-dependent changes in lens parameters based on literature values.
- Manipulated refractive index distribution and lens asphericity to maintain focus and match literature trends for spherical aberration and peripheral refraction.
Main Results:
- The model demonstrates spherical aberration levels comparable to young adults in unaccommodated states.
- Changes in spherical aberration with accommodation were approximately two-thirds of experimental findings.
- Peripheral refractions in the accommodated model closely matched their unaccommodated counterparts.
Conclusions:
- The developed wide-angle schematic eye model successfully integrates refraction and accommodation as variable inputs.
- This model provides a valuable tool for predicting aspects of retinal image quality in various refractive and accommodative states.
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