Optical Biometer Partial Annular Light Source
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Solution Overview
Problem
Existing optical coherence tomography (OCT) biometers face challenges in accurately measuring interfaces at different depths in the eye while providing a sufficient optical path modulation range and quick switching between various optical path lengths.
Innovation Solution
The optical biometer incorporates a light-source module emitting a partial annular light, a switchable light-splitting module, and a reference arm with a movable module and baffle system, allowing for accurate measurement of interfaces at different depths and quick switching between optical path lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complete annular light source is used to emit complete annular light to the eye, then the camera lens receives reflected light to obtain a complete annular image, but the optical path modulation range is insufficient for measuring interfaces at different depths
Solution Approach 1:
The patent divides the light source into multiple independent light-emitting units arranged in specific patterns (e.g., linear, triangular, rectangular arrangements of point light sources). This segmentation allows selective activation of different light source groups to generate different optical path lengths, enabling both precise measurement at specific depths and adaptable optical path modulation by activating different segments of the divided light source array.
2Productivity
If the reference arm uses a fixed optical path length, then the device structure is simple, but it cannot quickly switch between different optical path lengths required for anterior chamber and fundus measurement
Solution Approach 1:
The patent introduces a movable reflector in the reference arm that can be dynamically positioned to different locations. This dynamic element allows the reference arm to quickly switch between different optical path lengths by moving the reflector to predetermined positions, each corresponding to a specific measurement depth (anterior chamber or fundus). The dynamic design maintains relatively simple structure while enabling fast switching through controlled movement of the single movable component.
3Measurement precision
If the light source emits complete annular light, then the complete annular image is obtained, but the measurement accuracy for interfaces at different depths is reduced due to insufficient optical path modulation
Solution Approach 1:
The patent applies local quality by using different light source configurations for different measurement needs. Specific groups of light-emitting units are activated to create localized optical paths optimized for particular interfaces (e.g., cornea, lens, retina). Each light source group is positioned and configured to provide optimal optical path modulation for specific depth ranges, thereby improving measurement accuracy for different ocular interfaces while maintaining overall system precision.
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
This configuration enables the optical biometer to accurately measure interfaces at different depths in the eye, provide a larger optical path modulation range, and quickly switch between different optical path lengths, thereby improving measurement accuracy and efficiency.
Implementation Method 1
The light-source module is configured to emit an incident-light
Implementation Method 2
The light-splitting module is disposed corresponding to the light-source module and configured to divide the incident-light into a reference light and a sensing light
Implementation Method 3
The reference arm is disposed corresponding to the light-splitting module and configured to generate a first reflected-light according to the reference light
Implementation Method 4
The sensing arm is disposed corresponding to the light-splitting module and configured to emit the sensing light to an eye and receive a second reflected-light from the eye
Implementation Method 5
The sensing module is configured to generate a sensing result according to the first reflected-light and the second reflected-light
Data Source
AI summary
An optical biometer includes a light-source module, a light-splitting module, a reference-arm, a sensing-arm and a sensing module. The light-source module emits incident-light. The light-splitting module, disposed corresponding to light-source module, divides the incident-light into reference light and sensing light. The reference-arm, disposed corresponding to light-splitting module, generates a first reflected-light according to the reference light. The sensing-arm, disposed corresponding to the light-splitting module, emits the sensing light to the eye and receives a second reflected-light from the eye. The sensing module generates a sensing result according to the first reflected-light and second reflected-light. In a first mode, the sensing light is emitted to a first position of the eye. In a second mode, the sensing light is emitted to a second position of the eye. The incident-light emitted by light-source module is partial annular light and the sensing result includes a partial annular image related to the eye.