Contact Lens Structure With Peripheral Light Scattering for Myopia
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Solution Overview
Problem
Myopia, or nearsightedness, occurs when the axial length of the eye is longer than required for optimal focusing of distant objects, leading to blurry vision of distant objects despite the ability to focus on near objects, and is influenced by both genetic and behavioral factors.
Innovation Solution
The development of contact lenses with a clear aperture surrounded by an optically-scattering region, where scattering centers are integrated into the lens to reduce contrast in peripheral vision, thereby mitigating myopia by reducing the need for accommodation to focus distant objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contact lens with optically-scattering material is used to reduce peripheral contrast, then myopia progression is mitigated, but central visual acuity may be degraded
Solution Approach 1:
The contact lens implements different optical properties in different regions: the central region maintains high optical clarity for sharp central vision, while the peripheral region incorporates optically-scattering material to reduce contrast and mitigate myopia. This local differentiation resolves the contradiction by ensuring each region performs its specific function without compromising the other.
2Length of moving object
If the axial length of the eye increases during development, then the eye can focus on distant objects, but myopia progresses due to excessive elongation
Solution Approach 1:
The contact lens applies preliminary anti-action by reducing peripheral contrast before the eye completes its development. By modulating peripheral visual input during the emmetropization process, the lens prevents excessive axial elongation from occurring in the first place, thereby maintaining proper focusing accuracy as the eye grows.
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 contact lenses effectively reduce contrast in peripheral vision without significantly degrading central visual acuity, allowing for improved focus on distant objects and potentially mitigating myopia progression.
Implementation Method 1
The first portion is formed from a homogenous, optically clear material and the second portion is formed from an inhomogeneous, optically-scattering material
Data Source
Figure 1A~1B
Figure 2A~2D
Figure 3A~3C
AI summary
A method of making a contact lens includes providing a cylindrical blank for the contact lens, the cylindrical blank including a first portion and a second portion. The first portion is formed from a homogenous, optically clear material and the second portion is formed from an inhomogeneous, optically-scattering material. The method includes shaping the cylindrical blank to provide the contact lens. The contact lens includes a first region surrounded by a second region, the first region being formed from the homogenous, optically clear material and the second region being formed from the inhomogeneous, optically-scattering material.