Progressive Lens Zone Distribution Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing progressive multifocal ophthalmic lenses do not effectively optimize the entire vision field as a function of the chosen frame, failing to maintain a constant proportion between far-vision, near-vision, and intermediate-vision zones, which can lead to disturbed peripheral vision and reduced near-vision zones depending on the frame size.
Innovation Solution
A method that measures frame parameters and applies spatial transformation coefficients to maintain power and astigmatism defect values, shifting them on the lens surface to adapt the distribution of these zones based on frame size and shape, ensuring a minimum near-vision zone in smaller frames and improved peripheral vision in larger frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If progressive multifocal lenses are optimized for an average lens size, then the optical performance is improved for average frames, but the visual perception is disturbed in large frames and the near-vision zone is reduced in small frames
Solution Approach 1:
The patent applies parameter changes by transforming the optical prescription parameters (power and astigmatism defects) as a function of frame size. The method modifies the distribution of these optical parameters across the lens surface based on the specific frame dimensions, allowing the lens to maintain optimal optical performance whether the frame is large or small. This involves calculating adjusted power values and astigmatism corrections that compensate for the frame size effect.
Solution Approach 2:
The patent implements local quality by creating non-uniform distributions of power and astigmatism defects across different regions of the lens. Instead of applying a uniform optical correction, the method tailors the optical properties locally according to the frame size, ensuring that each region of the lens provides the appropriate correction for that specific area and frame configuration.
2Device complexity
If the lens is optimized for average frame dimensions, then the design complexity is reduced, but the near-vision zone accessibility is compromised in small frames
Solution Approach 1:
The method changes the optical parameters dynamically based on frame size measurements. By inputting the actual frame dimensions, the system calculates modified power and astigmatism values that ensure adequate near-vision zone accessibility. This parameter adaptation allows small frames to maintain sufficient near-vision area while large frames achieve proper peripheral vision, all through automated optical parameter transformation.
3Adaptability or versatility
If the frame size varies, then the wearer's choice of frame is increased, but the peripheral vision and dynamic vision are disturbed
Solution Approach 1:
The patent compensates for frame size variations by transforming the optical parameters. When a wearer selects a large frame, the system adjusts the power and astigmatism distribution to maintain proper peripheral vision coverage. For small frames, the parameters are modified to ensure adequate dynamic vision. This automated parameter adaptation allows wearers to choose frames based on aesthetic or comfort preferences without compromising visual performance.
Data Source
Figure 1~2
Figure 3a~3b
Figure 4a~4b
AI summary
A method for the determination by optical optimization of a personalized progressive ophthalmic lens intended to be inserted into a frame chosen by a given wearer for whom a power addition has been prescribed in near vision, the method comprising the stages of: - measuring parameters representing the frame chosen by the wearer; - choosing an initial distribution of power and resulting astigmatism defect targets for each direction of viewing under wearing conditions in an ordinary frame; - calculating transformation coefficients using the measured parameters representing the chosen frame and standard parameters; - calculating a personalized distribution of the power and resulting astigmatism defect targets on the lens by applying the calculated transformation coefficients to the initial distribution. The method makes it possible to retain the proportion of the distribution between the far-vision, near-vision and intermediate-vision zones whatever the size and the shape of the frame chosen.