Multizone Vision Correction Lens for Aberration and Dim-Light Focus
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Solution Overview
Problem
Commercially available contact lenses inefficiently utilize light for focusing images on the retina, leading to reduced visual acuity in dim light and aberrations due to light reflection, absorption, and transmission, placing a burden on the eyes.
Innovation Solution
An optical lens design with a first diopter correction portion and a second diopter correction portion, featuring varying diopter values and radii, to align with the eye's visual axis, reducing aberrations and extending depth of focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional contact lens is used, then the lens structure is simple, but the visual acuity in dim light is reduced due to insufficient light focusing efficiency
Solution Approach 1:
The lens is divided into multiple functional zones: a first diopter correction portion with gradually decreasing diopter values from the optical center to the periphery, and a second diopter correction portion with constantly varying diopter values. This segmentation allows different regions to perform different focusing functions, improving overall light focusing efficiency and visual acuity while maintaining a relatively simple single-lens structure.
Solution Approach 2:
Different regions of the lens are assigned different diopter values tailored to their specific functions. The first diopter correction portion has a gradient from N+3.5D to N D, while the second portion has constant variation from N-1.5D to N+1D. This local differentiation optimizes light focusing at various distances, addressing the dim light problem without requiring a complex multi-element system.
2Reliability
If light passes through the contact lens and eyes, then vision correction is achieved, but optical aberrations occur due to reflection and absorption
Solution Approach 1:
The lens design pre-compensates for potential aberrations by incorporating specific diopter gradient patterns before light reaches the retina. The gradual diopter decrease in the first portion and constant variation in the second portion are designed in advance to counteract reflection and absorption effects, ensuring accurate focus without requiring subsequent corrective actions by the eye's ciliary muscle.
Solution Approach 2:
The diopter values are systematically varied across different zones of the lens rather than being uniform. By changing the diopter parameter radially (from N+3.5D at the center to N D at the periphery in the first portion, and from N-1.5D to N+1D in the second portion), the lens optimizes light transmission and focus while minimizing aberrations caused by uniform single-lens designs.
3Illumination intensity
If the ciliary muscle regulates accommodation to overcome aberration and dim light, then image clarity is improved, but the eyes are subjected to increased burden
Solution Approach 1:
The lens design enables the eye to focus light more effectively without requiring active accommodation by the ciliary muscle. The multi-zone diopter correction portions are configured to automatically address both distance and near vision requirements, allowing the eye to maintain clear images under various lighting conditions without the metabolic and mechanical burden of continuous accommodation adjustments.
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 optical lens design enhances visual acuity in various lighting conditions by minimizing aberrations and increasing the depth of focus, providing stable and sharp images.
Implementation Method 1
an optical lens design with a first diopter correction portion and a second diopter correction portion, featuring varying diopter values and radii, to align with the eye's visual axis, reducing aberrations and extending depth of focus
Data Source
AI summary
An optical lens for vision correction adapted to correct a diopter value of N of an eye of a subject includes a vision correction area. The vision correction area includes an optical center, a first diopter correction portion, and a second diopter correction portion. The optical center is for aligning with a visual axis of the eye of the subject. The first diopter correction portion outwardly extends from the optical center and has a diopter value gradually decreasing from the optical center to a periphery of the first diopter correction portion. The optical center has a maximum diopter value ranging from N+3.5 D to N+9 D. The periphery of the first diopter correction portion has a diopter value of N. The second diopter correction portion surrounds and adjoins the first diopter correction portion, and has a diopter value constantly varying within a range from N−1.5 D to N+1 D.