Off-axis multi-channel optical imaging with secondary fixation target
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Solution Overview
Problem
Current ocular imaging devices face challenges in capturing comprehensive images of the eye when the pupil is small, as the primary fixation target may be obstructed by the iris, limiting the portion of the eye that can be imaged.
Innovation Solution
The optical imaging device incorporates multiple off-axis imaging channels with a secondary fixation target, allowing at least one imaging channel to be positioned favorably relative to the eye even with small pupils, enabling a greater portion of the eye to be imaged by adjusting the angle and orientation of the imaging channels, and potentially using a movable fixation target to optimize image acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a primary fixation target is used for multi-channel image acquisition, then comprehensive eye imaging is achieved, but the imaging is limited when pupil diameter is small due to iris obstruction
Solution Approach 1:
The patent introduces a secondary fixation target that is offset from the primary fixation target, effectively inverting the conventional approach by providing an alternative fixation point that bypasses the iris obstruction problem. This allows imaging channels to acquire images through different pupil regions, overcoming the limitation of small pupils.
Solution Approach 2:
The patent adds a spatial dimension to the fixation target configuration by positioning the secondary fixation target at a different location than the primary target. This dimensional change enables multiple imaging channels to access different optical paths through the pupil, thereby avoiding iris obstruction while maintaining comprehensive eye coverage.
2Area of stationary object
If multiple imaging channels are positioned at different angles, then a greater portion of the eye can be imaged, but device complexity increases
Solution Approach 1:
The patent divides the imaging system into multiple independent imaging channels, each with its own optical pathway and fixation target. This segmentation allows each channel to be optimized for specific imaging angles and regions, achieving comprehensive eye coverage while maintaining modular design that manages complexity through functional decomposition.
Solution Approach 2:
The patent designs the multiple imaging channels to share common structural elements and support infrastructure while performing specialized functions. Each channel can be configured for specific angular orientations and imaging regions, but they collectively provide comprehensive eye imaging capability, achieving multi-functionality without proportionally increasing overall device complexity.
Data Source
AI summary
An optical imaging device includes a plurality of imaging channels. Each imaging channel of the plurality of imaging channels may include a discrete optical imaging pathway, and the plurality of imaging channels may be disposed within a support structure. The plurality of imaging channels may be aimed at different angles relative to each other. The optical imaging device may also include a secondary fixation target within at least one imaging channel of the plurality of imaging channels such that at least one corresponding optical imaging pathway fits through a pupil diameter that is smaller than a minimum pupil diameter for multi-channel image acquisition with primary fixation.