Alternating Ophthalmic Lenses for Binocular Visual Performance
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Solution Overview
Problem
Current methods for selecting ophthalmic lenses, such as intraocular lenses (IOLs), often neglect the visual performance of the other eye, resulting in suboptimal binocular vision for patients, as they are typically chosen without consideration for the combined visual effects of both eyes.
Innovation Solution
The method involves selecting two ophthalmic lenses with different focusing characteristics, where at least one is a multifocal lens, to enhance binocular visual performance by optimizing parameters like image contrast, visual acuity, and stereo acuity through the relation B=(Lkl+Rkr)1kb, ensuring improved binocular vision by balancing the visual performance of each lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ophthalmic lenses are selected without considering the visual performance of the other eye, then the selection process is simple and quick, but the binocular visual performance is suboptimal
Solution Approach 1:
The patent implements a feedback mechanism where the visual performance of one lens is used to determine the appropriate lens for the other eye. The system calculates the visual performance of a first lens, then uses this information as feedback to select a second lens that optimizes overall binocular visual performance, rather than selecting lenses independently.
Solution Approach 2:
The patent changes the selection parameters from individual lens characteristics alone to a combined binocular visual performance metric. By using parameters such as binocular visual acuity, contrast sensitivity, and stereoacuity that account for the interaction between both eyes, the system optimizes the overall visual outcome while maintaining an efficient selection process.
2Reliability
If lenses with different focusing characteristics are selected for each eye, then binocular visual performance is improved, but the lens selection complexity increases
Solution Approach 1:
The patent systematically varies lens parameters such as optical power, add power, and focal length between the two eyes to achieve different focusing characteristics. This parameter differentiation allows optimization of binocular visual performance while the structured approach to parameter selection manages the complexity of the decision-making process.
Solution Approach 2:
The patent applies the principle of local quality by tailoring the lens characteristics to the specific visual needs of each eye. Rather than using identical lenses for both eyes, the system optimizes each lens individually based on the patient's binocular visual performance requirements, allowing different focusing characteristics in each eye to contribute to overall visual function.
3Measurement precision
If multifocal lenses are used to enhance near and distance vision, then visual acuity improves, but image contrast may be reduced
Solution Approach 1:
The patent optimizes the balance between visual acuity and image contrast by carefully selecting lens parameters such as add power, optical zone diameter, and focal length ratios. By adjusting these parameters, the system achieves improved near and distance visual acuity while minimizing the negative impact on image contrast through precise control of the multifocal lens characteristics.
Solution Approach 2:
The patent applies local quality by creating different optical zones within the multifocal lenses with varying focusing properties. The lens design incorporates regions optimized for different visual tasks (near, intermediate, and distance vision) with specific contrast and acuity characteristics, allowing the system to enhance visual acuity in specific zones while maintaining acceptable contrast overall.
Data Source
AI summary
In one aspect, the present invention provides a method for correcting vision that employs two lenses, at least one of which is a multifocal lens, with different focusing characteristics for use in the two eyes of the patient. The visual performance of each lens (e.g., visual contrast or acuity) is selected in accordance with a predefined relation so as to optimize the binocular visual performance provided by the combination of the lenses.