Subjective Optometry Apparatus Projection Magnification Correction
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Solution Overview
Problem
Existing subjective optometry apparatuses face challenges in accurately measuring optical characteristics due to changes in the position of the target light flux incident on optical elements, leading to variations in projection magnification, which can result in inaccurate measurements even when the eye and apparatus are properly aligned.
Innovation Solution
A subjective optometry apparatus equipped with a calibration optical system, a positional information acquisition component, and a correction mechanism that adjusts the projection magnification of the target light flux based on acquired positional information, ensuring accurate alignment and measurement by correcting for deviations in the pupil conjugate position and eye refractive power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the target light flux position changes incident to the optical element, then the projection magnification of the examination target changes, but the measurement accuracy deteriorates
Solution Approach 1:
The apparatus employs a feedback mechanism where the position of the target light flux incident to the optical element is detected, and based on this detection, the projection magnification is corrected. This closed-loop feedback system ensures that variations in light flux position are compensated, maintaining stable projection magnification and accurate measurement results.
Solution Approach 2:
The system dynamically adjusts the projection magnification parameter based on the detected position of the target light flux. By changing the magnification parameter in response to position variations, the system maintains consistent measurement conditions despite changes in alignment or light flux position.
2Ease of operation
If the examinee's eye position deviates from the optimal alignment, then the ease of operation is improved (no strict alignment required), but the projection magnification becomes inaccurate
Solution Approach 1:
The apparatus detects the position of the target light flux and uses this information to correct the projection magnification. This feedback mechanism allows the system to maintain accurate measurements even when the examinee's eye position deviates from the optimal alignment, effectively decoupling measurement accuracy from strict alignment requirements.
Solution Approach 2:
The system automatically detects and corrects for position deviations without requiring manual realignment by the operator. The automatic detection and correction of light flux position and magnification adjustments enable the apparatus to self-correct for alignment errors, improving ease of operation while maintaining measurement precision.
Data Source
AI summary
A subjective optometry apparatus includes a light projecting optical system that projects a target light flux to an examinee's eye, a fixed optical element that guides an image of the target light flux to the examinee's eye so as to have an optically predetermined examination length, a calibration optical system disposed in an optical path of the light projecting optical system to change optical characteristics of the examinee's eye, a measurement unit that accommodates the light projecting optical system; a positional information acquiring portion that acquires positional information of the measurement unit, a correction amount setting portion that sets a correction amount for correcting a projection magnification of the target light flux projected to the examinee's eye, based on the positional information, and a correction portion that corrects the projection magnification of the target light flux based on the correction amount set by the correction amount setting portion.