Ophthalmologic Apparatus Correcting Non-Linear Incident Angles
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Solution Overview
Problem
Ophthalmologic apparatuses using ellipsoidal or concave mirrors face challenges in achieving highly accurate OCT measurements due to non-linear relationships between the deflection angle of the optical scanner and the incident angle of the measurement light at the subject's eye position, leading to non-uniform intervals and reduced measurement accuracy.
Innovation Solution
An ophthalmologic apparatus and method that includes a concave mirror and an optical scanner, which acquires a first data set group through OCT and corrects it using stored correction data to generate a second data set group, ensuring uniform incident angles and improving measurement accuracy by considering the deflection and incident angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If an ellipsoidal mirror is used to expand the measurement angle, then the measurement angle is widened, but the measurement precision deteriorates due to non-linear angle relationships
Solution Approach 1:
The patent applies parameter changes by introducing correction data that adjusts the incident angle parameters based on the deflection angle. The correction unit modifies the measurement parameters dynamically to compensate for the non-linear relationship, thereby maintaining measurement precision while using an ellipsoidal mirror to widen the measurement angle.
Solution Approach 2:
The patent implements feedback through the correction unit that receives deflection angle information and applies corresponding corrections to the incident angle. This feedback mechanism ensures that the non-linear effects are continuously compensated, maintaining measurement precision across the widened measurement angle range.
2Area of stationary object
If an optical scanner is used to deflect measurement light, then the measurement coverage is expanded, but the uniformity of incident angles deteriorates
Solution Approach 1:
The patent uses parameter changes by storing and applying correction data that adjusts incident angle parameters based on deflection angle parameters. This allows the system to maintain uniform incident angle distribution across the expanded measurement coverage achieved by the optical scanner.
3Measurement precision
If correction data is introduced to improve measurement accuracy, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent applies copying by storing correction data that represents the non-linear relationship characteristics in a lookup table or database. Instead of implementing complex real-time calculations, the system copies pre-computed correction values and applies them based on the deflection angle, thereby improving measurement accuracy while minimizing the increase in device complexity.
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
The solution enables OCT measurements with a wider angle and higher accuracy by uniformly arranging scan positions and correcting for non-linearities, resulting in improved data set groups that enhance imaging quality and precision.
Implementation Method 1
a data acquisition unit including a concave mirror and an optical scanner configured to deflect light from a light source to guide to a reflective surface of the concave mirror, and configured to acquire a first data set group in an A-scan direction by performing optical coherence tomography on a subject's eye placed at a subject's eye position or a conjugate position of the subject's eye position using light reflected by the reflective surface
Implementation Method 2
an optical scanner configured to deflect light from a light source to guide to a reflective surface of the concave mirror
Data Source
AI summary
An ophthalmologic apparatus includes a data acquisition unit, a storage unit, and a correction unit. The data acquisition unit includes a concave mirror and an optical scanner configured to deflect light from a light source to guide to a reflective surface of the concave mirror. The data acquisition unit is configured to acquire a first data set group in an A-scan direction by performing optical coherence tomography on a subject's eye placed at a subject's eye position or a conjugate position of the subject's eye position using light reflected by the reflective surface. The storage unit is configured to store correction data for correcting an incident angle of the light at the subject's eye position depending on a deflection angle of the light by the optical scanner. The correction unit is configured to generate a second data set group by correcting at least a part of the first data set group based on the correction data stored in the storage unit.