Asymmetric Ocular Lens Power Profiles for Peripheral Retinal Focus
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Solution Overview
Problem
Existing methods fail to effectively address the asymmetric curvature of field in the retina, leading to inadequate correction of refractive errors such as myopia and hyperopia, as they assume a symmetric curvature, which results in under- or over-correction in different quadrants of the peripheral retina.
Innovation Solution
Designing optical devices, including contact lenses and spectacle lenses, with asymmetric refractive powers in nasal and temporal zones to correct for the asymmetric curvature of field, ensuring that peripheral images are focused appropriately on or in front of the retina for myopes and behind for hyperopes, thereby addressing the asymmetry and reducing aberrant eye growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If symmetric refractive power is used in optical devices, then manufacturing is simpler and device design is easier, but refractive error correction is inadequate due to asymmetric curvature of field in the retina
Solution Approach 1:
The patent applies asymmetry by designing optical devices with different refractive powers for nasal and temporal zones. The lens comprises a first zone (nasal) with first refractive power and a second zone (temporal) with second refractive power, where the refractive powers differ to match the asymmetric curvature of the retinal surface. This resolves the contradiction by prioritizing correction accuracy over manufacturing simplicity.
Solution Approach 2:
The patent implements local quality by providing different optical properties in different regions of the lens. The nasal and temporal zones have customized refractive powers tailored to the specific curvature characteristics of each retinal region. This allows precise local correction while maintaining overall device functionality.
2Measurement precision
If conventional symmetric lenses are used, then device complexity is reduced, but peripheral image focus is inaccurate leading to under- or over-correction in different quadrants
Solution Approach 1:
The patent uses asymmetry to match the asymmetric curvature of the retinal surface. By providing different refractive powers for nasal and temporal zones, the lens achieves accurate focus across all peripheral quadrants, eliminating under- and over-correction problems while accepting increased design complexity.
Solution Approach 2:
The lens is segmented into multiple zones (nasal and temporal) with distinct optical properties. This segmentation allows each zone to be optimized independently for its specific retinal region, improving overall measurement precision while managing design complexity through systematic division.
3Reliability
If asymmetric refractive powers are implemented in nasal and temporal zones, then refractive error correction is improved and aberrant eye growth is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent implements local quality by customizing refractive powers for nasal and temporal zones based on measured retinal curvature. This ensures reliable control of eye growth progression by providing precise local correction, while the systematic approach to manufacturing asymmetric lenses addresses the fabrication complexity.
Solution Approach 2:
The patent changes the refractive power parameter across different zones of the lens to match retinal curvature variations. By systematically varying this optical parameter in nasal and temporal zones, the invention achieves reliable eye growth control while establishing a manufacturable parameter-based design approach.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively corrects refractive errors by placing peripheral images on or near the retina, reducing the stimulus for aberrant eye growth and potentially slowing the progression of myopia and hyperopia.
Implementation Method 1
The lens comprises a nasal optic zone and a temporal optic zone for refracting light to be received by the peripheral retina
Data Source
AI summary
A lens for an eye that includes a zone with a first power profile for images received by the retina on the fovea, a zone with a second power profile for images received by the peripheral retina on the nasal side and a zone with a third power profile for images received by the peripheral retina on the temporal side. The first power profile is selected to provide clear or acceptable vision and the second and third power profiles are selected to affect the peripheral image position.