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Multifocal contact lens myopia control: central and peripheral retinal image quality
1Division of Neurobiology, University of California, Berkeley, Berkeley, CA, USA.
Clinical & Experimental Optometry
|May 9, 2022
Summary
Multifocal contact lenses may help control myopia by reducing near target blur, not by altering peripheral retinal image quality. This therapy is crucial for managing myopia progression in children.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Myopic defocus in the peripheral retina inhibits eye growth, motivating myopia control therapies like multifocal contact lenses.
- Understanding light-triggered eye-length regulation requires knowledge of retinal light spread, which is lacking for multifocal contact lenses.
Purpose of the Study:
- To estimate retinal image spread from multifocal contact lenses using computational modeling.
- To investigate the impact of multifocal zones on image quality in the central and peripheral retina.
Main Methods:
- Utilized "through-focus" diffraction computations in contact lens/eye models.
- Incorporated polychromatic light, chromatic aberrations, and an M-cone phototransduction layer.
- Analyzed point- and edge-spread distributions of phototransduction activation.
Main Results:
- Multifocal zones caused veiling for in-focus viewing and improved near-target image quality in the unaccommodated central retina.
- These image quality improvements were significantly reduced in the retinal periphery.
- The precise configuration of multifocal zones did not appear critical for therapeutic effects.
Conclusions:
- The therapeutic value of multifocal contact lenses for myopia control is likely due to reduced near-target blur, which lessens the stimulus for accommodation.
- The benefits are not strongly dependent on specific multifocal zone configurations or peripheral retinal image quality changes.
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