Glare Index Calculation for Spectacle Lens Selection

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Solution Overview

Problem

Current methods for evaluating and addressing glare sensitivity in individuals are inadequate, as they do not effectively quantify glare perception to guide the selection of suitable spectacle lenses.

Innovation Solution

A visual function examination system that includes a response information acquisition unit to gather data on glare perception and a glare index calculation unit to determine an index for glare sensitivity, allowing for the selection of appropriate spectacle lenses based on this index.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional glare evaluation methods are used, then the examination process is simple, but the measurement precision of glare sensitivity is insufficient

Engineering Contradiction:

Improveglare sensitivity measurement precisionVSAvoidexamination system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent introduces an evaluation image as an intermediary tool that contains a glare source region and a non-glare source region. This evaluation image mediates between the subject's visual system and the measurement device, enabling precise quantification of glare sensitivity through controlled visual stimuli while maintaining a relatively simple examination system structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If no quantitative glare index is calculated, then the examination process is simple, but the adaptability for selecting suitable spectacle lenses is poor

Engineering Contradiction:

Improvespectacle lens selection adaptabilityVSAvoidexamination efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent implements a feedback mechanism where the subject's responses to the evaluation image are processed to calculate a quantitative glare index. This feedback loop provides actionable data that guides the selection of suitable spectacle lenses, improving adaptability while maintaining examination efficiency through automated index calculation.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent transforms subjective glare perception into an objective quantitative parameter (glare index) by analyzing the subject's responses to controlled visual stimuli. This parameter change enables systematic adaptation to different spectacle lens requirements based on measured glare sensitivity levels.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If subjective glare assessment is used, then the ease of operation is high, but the reliability of glare evaluation is insufficient

Engineering Contradiction:

Improveglare evaluation reliabilityVSAvoidexamination operation simplicity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces subjective mechanical assessment with an objective measurement system based on controlled optical stimuli and standardized response collection. The evaluation image with defined glare and non-glare regions provides consistent, reproducible measurements that improve reliability while maintaining ease of operation through a user-friendly examination interface.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20230320582A1Visual function examination device, spectacle lens presentation system, printed matter, visual function examination method, spectacle lens presentation method, and computer-readable medium

Publication Date: 2023.10.12 NIKON ESSILOR

AI summary

A visual function examination device includes a response information acquisition unit configured to acquire response information indicating a response about glare felt by a subject to a visual target based on a glare illusion and a glare index calculation unit configured to calculate an index for the glare felt by the subject on the basis of the response information acquired by the response information acquisition unit.