Single-Vision Ophthalmic Lens Usage Index for Myopia Comfort and Aesthetics
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Solution Overview
Problem
Myopic individuals often face dissatisfaction with traditional corrective lenses due to aesthetic and comfort issues, such as thick edges, poor fit, and visual discomfort, leading to low wearing satisfaction rates.
Innovation Solution
A method for determining an usage index value for single-vision ophthalmic lenses that considers optical and material profiles, evaluating six criteria: physical comfort, visual comfort, aesthetics, eyestrain, and lens renewal, using a computer-assisted approach to select lenses with improved antireflective coatings and aspherical designs for enhanced wearing comfort and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional corrective lenses are used for myopia, then vision correction is achieved, but aesthetic appearance deteriorates due to thick edges and image jump
Solution Approach 1:
The patent applies aspherical lens design where the lens surfaces follow aspherical curves rather than simple spherical shapes. This allows the lens to maintain optimal optical power distribution while reducing edge thickness and eliminating the image jump effect at lens periphery, thus resolving the contradiction between vision correction reliability and aesthetic appearance.
Solution Approach 2:
The patent changes the optical parameters by using high refractive index materials (such as 1.67, 1.74, or higher) and adjusting the curvature radii of lens surfaces. These parameter changes enable the lens to achieve the same corrective power with reduced thickness, improving both aesthetics and comfort while maintaining vision correction effectiveness.
2Shape
If high refractive index materials are used to reduce lens thickness, then aesthetic appearance improves, but manufacturing complexity increases
Solution Approach 1:
The patent systematically adjusts multiple manufacturing parameters including refractive index selection, aspherical curve coefficients, and surface curvature radii. By optimizing these parameters together, the lens achieves reduced thickness with high refractive index materials while maintaining manufacturability through standardized aspherical surface designs that can be produced using conventional lens manufacturing equipment.
3Shape
If lens size is reduced to improve aesthetics, then edge thickness decreases, but field of view is restricted
Solution Approach 1:
The aspherical design allows for optimized surface curvature that expands the effective optical field of view. The varying curvature across the lens surface maintains image quality and correction effectiveness over a wider angular range, enabling larger usable lens areas without increasing edge thickness, thus resolving the contradiction between aesthetics and field of view.
4Ease of manufacture
If conventional lens designs are used, then manufacturing is simple, but wearer satisfaction is low due to comfort and aesthetic issues
Solution Approach 1:
The aspherical lens design improves wearing comfort by providing better optical performance across the entire visual field, reducing peripheral distortion and image jump effects. The optimized surface curvature also improves cosmetic appearance by reducing edge thickness, thereby increasing overall wearer satisfaction while maintaining compatibility with standard manufacturing processes.
Solution Approach 2:
By adjusting key parameters such as refractive index, aspherical coefficients, and base curve radii, the lens achieves improved comfort and aesthetics. These parameter optimizations allow the lens to better adapt to the wearer's facial features and visual requirements, enhancing wearing experience while remaining manufacturable with conventional techniques.
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 method enhances wearer satisfaction by optimizing lens selection based on personalized criteria, resulting in improved physical and visual comfort, wider frame options, and better aesthetic appeal, increasing satisfaction rates to 45% compared to traditional lenses.
Implementation Method 1
lenses having good aesthetics and antireflective properties
Data Source
Figure 1
AI summary
The invention relates to a method for determining an usage index value for an single-vision ophthalmic lens adapted to correct the vision of a myopic wearer. According to the invention the method comprises: - an optical profile providing step S1 during which an optical profile of said ophthalmic lens is determined; - a material profile providing step S2 during which a material profile of said ophthalmic lens is determined; - a physical parameter determining step S3 during which at least one physical parameter among physical parameters of said optical profile and material profile is determined; - a gain assessing step S4 during which at least two gains brought by at least one determined physical parameter is evaluated on at least one evaluation criterion of dissatisfaction of said wearer when wearing said ophthalmic lens; - an usage index value determining step S5 during which a value of an usage index is determined by adding the assessed gain for the evaluation criteria.