Spectacle Lens Selection Using Simultaneous Aberration Comparison
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Solution Overview
Problem
Existing methods for determining spectacle lenses do not accurately consider a subject's sensitivity to aberration, leading to inaccurate measurements due to factors like memory, fatigue, and adaptability, and require lengthy evaluation times.
Innovation Solution
A method involving the simultaneous presentation of multiple blurred images with varying aberrations to a subject for comparison, using similar and difficulty level-varied images, to measure sensitivity to aberration accurately and efficiently, while considering the characteristic direction of spatial frequency characteristics and visual acuity, and determining a spectacle lens based on this sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple blurred images are presented sequentially to measure aberration sensitivity, then the measurement can be performed, but memory effects and fatigue lead to reduced measurement precision and increased evaluation time
Solution Approach 1:
The patent merges multiple image presentations into a single simultaneous display. Multiple blurred images with different aberration amounts are shown at the same time on a display device, allowing the subject to compare them without sequential memory retrieval. This eliminates time-related degradation while maintaining measurement capability.
Solution Approach 2:
The patent transitions from temporal presentation (sequential images over time) to spatial presentation (multiple images displayed simultaneously). By arranging images in different spatial locations on the display, the subject can compare aberration levels without relying on memory across time, thus improving precision while reducing time loss.
2Measurement precision
If sequential blurred image presentation is used, then the procedure can be completed, but memory and adaptability factors reduce measurement accuracy
Solution Approach 1:
The patent combines multiple image presentations into a single simultaneous display configuration. All blurred images with varying aberration amounts are presented together on one display device, eliminating the need for sequential presentation and memory-dependent comparisons, thereby improving accuracy without significantly increasing procedural complexity.
Solution Approach 2:
The patent creates multiple copies of the same original image with different aberration amounts applied. These copies are displayed simultaneously, allowing direct comparison without requiring the subject to remember previous images. This copying approach simplifies the evaluation procedure while enhancing measurement accuracy.
3Reliability
If standard blurred images are used for evaluation, then the process can be completed, but including similar and difficulty level-varied images improves measurement reliability
Solution Approach 1:
The patent applies local quality by creating images with specifically controlled local characteristics. Similar blurred images maintain the same overall structure but vary in local aberration amounts, while difficulty level-varied images adjust local contrast and detail. This targeted variation improves measurement reliability by focusing on specific aberration effects without unnecessarily complicating the overall image set.
Data Source
AI summary
A method for determining a spectacle lens, the method including: preparing multiple blurred images in which an amount of added aberration is varied with respect to a predetermined original image; simultaneously presenting the multiple blurred images to a subject to compare appearances of them, then obtaining a subjective response of the subject, to thereby measure a subject's sensitivity to aberration; and determining a spectacle lens suitable for the subject based on the subject's sensitivity to aberration.