Star-Shaped Optical Zone Lens for Myopia Control
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Solution Overview
Problem
Conventional peripheral defocusing lenses with circular optical zones degrade horizontal or vertical para-central visual field focus, leading to impaired visual performance and safety issues during tasks like reading, and fail to effectively slow myopia progression.
Innovation Solution
A star-shaped optical zone with convex parts and a defocus area on the lens surface, allowing clear imaging on the central retina while inducing myopic retinal defocus to slow myopia progression, and using the diagonal area for increased defocus effect without enhancing lens power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circular optical zone is used in peripheral defocusing lens, then the lens can provide peripheral defocus effect, but the horizontal or vertical para-central visual field focus is degraded
Solution Approach 1:
The patent applies asymmetry by changing the optical zone from a conventional circular shape to a star-shaped configuration with multiple convex parts. This asymmetric design allows different regions of the lens to serve different functions: the convex parts maintain clear focus for horizontal and vertical para-central vision, while the diagonal regions between convex parts provide peripheral defocus effect. This resolves the contradiction by enabling both clear central vision and peripheral defocus simultaneously.
2Reliability
If the optical zone diameter is reduced to increase defocus area, then myopia progression is slowed, but the ability to focus at horizontal or vertical para-central visual field is significantly degraded
Solution Approach 1:
The patent segments the optical zone into multiple convex parts arranged in a star pattern. Each convex part maintains a sufficient diameter to support clear focus for para-central vision during reading and visual search tasks. The spaces between these segmented convex parts create additional defocus areas, effectively increasing the total defocus image area without compromising the optical quality of individual convex regions. This segmentation strategy resolves the contradiction between maintaining adequate optical zone size and maximizing defocus effect.
3Reliability
If the defocus degree of the lens is increased to slow myopia progression, then the defocus image area increases, but the visual performance and safety during daily tasks is affected
Solution Approach 1:
The patent applies local quality by creating regions of different optical properties within the same lens. The convex parts of the star-shaped optical zone provide high optical quality with strong defocus effect for myopia control, while the diagonal regions between convex parts provide areas with different defocus characteristics. This spatial variation in optical quality allows the lens to deliver strong peripheral defocus for myopia progression control while maintaining adequate visual performance for daily tasks through the strategically positioned convex parts.
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 star-shaped design ensures clear vision during horizontal and vertical movements, extends the defocus image area on the retina, and reduces myopia progression without excessive lens power, improving comfort and visual performance.
Implementation Method 1
The lens includes a optical zone formed on a surface of a central optical area thereof and configured to pass light to clearly image on a central imaging area of retina, and a defocus area formed on a portion of the central optical area other than the optical zone and configured to defocus and image on the central imaging area
Data Source
AI summary
A lens with star-shaped optical zone to increase defocus image area is disclosed. The lens includes a central optical area to pass light to image on central imaging area of retina; a peripheral optical area formed around the central optical area and configured to pass light to image on a peripheral image blurring area on peripheral of the central imaging area; a star-shaped optical zone formed on the surface of the central optical area and configured to pass light to clearly image on the central imaging area; and a defocus area formed on a portion of the central optical area other than the optical zone. The defocus area can be used to increase defocus image area of the central imaging area, to extend a range of the optical area having defocus effect on the retina without the need to excessively increasing the defocus power of the lens.