Amplitude of Accommodation Measurement via Dynamic Optotype Display
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Solution Overview
Problem
Conventional amplitude of accommodation measuring apparatus requires exchanging optotypes and additional trial lenses, making the measurement process time-consuming and cumbersome.
Innovation Solution
An amplitude of accommodation measuring apparatus with a display member, optical system, driving member, and control member that moves along an optical axis to calculate the amplitude of accommodation without exchanging optotypes, using push buttons to control the movement and determine blurring points, allowing for precise and efficient measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optotypes and trial lenses are exchanged to measure near point and far point, then measurement accuracy is improved, but measurement time increases and ease of operation deteriorates
Solution Approach 1:
The patent combines the far optotype and near optotype into a single integrated optotype structure that can be displayed simultaneously on the display member. The control member selectively presents either the far optotype or near optotype without requiring physical exchange of components, thereby merging multiple measurement functions into one unified system that reduces measurement time while maintaining accuracy
Solution Approach 2:
The patent employs a display member with dynamic control capability that can switch between displaying far optotype and near optotype images electronically. This dynamic switching replaces static physical optotype exchanges, allowing rapid transition between measurement modes without mechanical intervention, thus reducing measurement time while preserving measurement precision
2Measurement precision
If optotypes and trial lenses are exchanged to measure near point and far point, then measurement accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The patent replaces the mechanical system of physically exchanging optotypes and trial lenses with an electronic display and control system. The display member presents optotype images electronically, and the control member manages the switching between far and near optotypes automatically, eliminating manual handling operations while maintaining measurement accuracy
Solution Approach 2:
The patent creates a universal measurement system where a single integrated optotype structure serves multiple functions - displaying both far optotype and near optotype images through electronic control. This multi-functional design eliminates the need for separate physical optotypes and trial lenses, improving ease of operation while preserving the ability to accurately measure both near and far points
Data Source
AI summary
Shift lenses 20L, 20R are provided on optical axes that pass through LCDs 40L, 40R for displaying an image for focusing. The shift lenses 20L, 20R are moved along the optical axes by pressing a focus button provided on a case 10 in accordance with an instruction displayed on the LCDs 40L, 40R. An amplitude of accommodation is calculated on the basis of a position where the image starts blurring upon moving the shift lenses 20L, 20R from a far point side focus position, and a position where the image starts blurring upon moving the shift lenses 20L, 20R from a near point side focus position.