Mask Lens Design for Myopia Control via Segmented Zones
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Solution Overview
Problem
Conventional corrective lenses for myopia do not address the underlying cause of the condition and fail to slow or retard myopia progression, as they do not adequately reduce the impact of hyperopic blur on retinal image quality, leading to continued eye growth and potential development of high myopia associated with retinal disease and other complications.
Innovation Solution
The development of mask lens designs with a power profile that includes a central zone and peripheral zones with different dioptric power, combined with an opaque mask, providing increased depth of focus and reduced image quality sensitivity to minimize the degradation of retinal image quality, thereby slowing or preventing myopia progression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional corrective lenses are used to shift focus to the retinal plane, then distance vision is corrected, but myopia progression continues because hyperopic blur during near work still stimulates axial eye growth
Solution Approach 1:
The lens is divided into multiple zones with different optical powers: a central distance vision zone and peripheral near vision zones. This segmentation allows different parts of the lens to serve different functions, with the peripheral zones providing myopic defocus to reduce hyperopic blur stimulus during near work activities
Solution Approach 2:
Different regions of the lens are assigned different dioptric powers tailored to specific viewing distances. The central zone maintains distance vision correction while peripheral zones introduce controlled myopic defocus, creating local optical quality variations that address both distance vision and myopia progression prevention
2Reliability
If multiple lens zones with different powers are introduced to prevent myopia progression, then myopia control is improved, but lens design complexity increases
Solution Approach 1:
The lens is divided into multiple zones with different optical powers: a central distance vision zone and peripheral near vision zones. This segmentation allows different parts of the lens to serve different functions, with the peripheral zones providing myopic defocus to reducehyperopic blur stimulus during near work activities
Solution Approach 2:
The lens design varies the dioptric power parameter across different radial zones of the lens. By systematically changing the power parameter from the central zone to peripheral zones, the lens achieves complex optical functionality while maintaining a predictable gradient structure that simplifies manufacturing
Data Source
AI summary
Contact lenses incorporate mask lens designs that at least one of slow, retard or preventing myopia progression. The lens includes a first zone at a center of the lens; at least one peripheral zone surrounding the center and having a dioptric power that is different than that at the center; and an opaque mask beginning at a radial distance from the center, thereby providing a lens power profile having substantially equivalent foveal vision correction to a single vision lens, and having a depth of focus and reduced retinal image quality sensitivity that slows, retards, or prevents myopia progression.