Asymmetric Progressive Lens Design for Pupil Height Mismatch
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional progressive addition lenses are designed assuming symmetrical pupil height positions for both eyes, which can lead to inadequate near vision due to differences in pupil height between the right and left eyes, resulting in mismatched visual line positions and power effects.
Innovation Solution
A spectacle lens producing apparatus and method that sets distinct corridor lengths and refractive powers for each eye based on individual prescription information and pupil height differences, using a reference lens and object surface to ensure proper alignment and binocular vision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If progressive addition lenses are designed with symmetrical layout assuming equal pupil height positions for both eyes, then manufacturing and design simplicity is maintained, but binocular vision quality deteriorates for wearers with different pupil height positions
Solution Approach 1:
The patent applies asymmetry by designing the progressive addition lens with different corridor lengths for the right and left eyes. Specifically, when the pupil height positions differ between eyes, the lens configuration is adjusted so that one eye has a longer corridor length than the other, creating an asymmetric optical path that compensates for the anatomical difference in pupil positions and enables proper binocular vision.
2Productivity
If conventional symmetrical progressive addition lenses are used, then production efficiency is maintained, but near vision capability deteriorates for wearers with asymmetric pupil height positions
Solution Approach 1:
The patent implements local quality by customizing specific parameters of the progressive addition lens for each eye based on individual pupil height measurements. The corridor length, optical center position, and progressive zone configuration are locally adjusted for the right and left eyes separately, allowing the lens to optimize near vision performance for each eye's specific anatomical characteristics while maintaining overall lens functionality.
3Device complexity
If standard progressive addition lens design is applied to wearers with different pupil height positions, then design process simplicity is maintained, but visual line alignment accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by performing detailed measurements of the wearer's pupil height positions for both eyes before lens design begins. These measurements are used to pre-calculate the appropriate corridor lengths and optical center positions for each eye, allowing the lens to be designed with precise visual line alignment from the outset rather than requiring post-manufacturing 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
This approach provides improved binocular vision and balanced addition effects for wearers with differing pupil height positions, reducing visual line discrepancies and enhancing near vision capabilities.
Implementation Method 1
design, for each of the set right and left prescription lenses, a corridor of the prescription lens on the basis of a principal ray from each object point on the reference object surface
Data Source
Figure 1~2
Figure 3
Figure 4(a)~4(b)
AI summary
A pair of right and left spectacle lenses each includes: a distance vision region and a near vision region; and a progressive region in which a refractive power progressively changes between the distance vision region and the near vision region. In the pair of right and left spectacle lenses mounted in a spectacle frame, a height position of a distance eye point (F) that is a reference point of the distance vision region is different between right and left, and a corridor length connecting the distance vision region and the near vision region is different between right and left.