Ophthalmic Examination Head Retraction for Nose-Safe Eye Switching
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Solution Overview
Problem
Existing ophthalmic devices face challenges in accurately aligning the examination head with both eyes of a subject, particularly due to the short operating distance between the examination head and the subject's face, which can lead to the head coming closer to the nose during left-right eye switching, compromising examination accuracy and reliability.
Innovation Solution
The ophthalmic device incorporates a displacement mechanism with a drive controlling unit that tilts and retracts the examination head away from the subject's face, using a displacement mechanism to adjust the examination head's position along an axis of tilt and a retraction controlling unit to avoid the face, ensuring accurate alignment and preventing the head from approaching the nose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the examination head is positioned close to the subject's face to achieve accurate alignment, then measurement precision is improved, but the risk of the head coming closer to the nose during eye switching increases, worsening reliability
Solution Approach 1:
The system performs preliminary detection of the nose position using a camera before examination, and pre-establishes a safe distance constraint based on this detection. The displacement mechanism is controlled to maintain this pre-calculated safe distance, preventing the examination head from approaching the nose during eye switching while preserving alignment accuracy for the eyes.
2Productivity
If the operating distance is shortened to improve examination efficiency, then productivity is improved, but the examination head may come closer to the nose, worsening reliability
Solution Approach 1:
The system dynamically adjusts the operating distance of the examination head based on real-time detection of the nose position and the current examination state. During eye switching, the system automatically increases the distance from the nose while maintaining optimal examination distance, allowing short operating distance for efficiency while preventing nose contact for reliability.
3Reliability
If the examination head is retracted away from the face to avoid the nose, then reliability is improved, but alignment accuracy may deteriorate
Solution Approach 1:
The system applies different spatial relationships locally: the examination head maintains a fixed safe distance from the nose (avoiding the nose region), while simultaneously maintaining optimal alignment distance from the eyes (examination region). The displacement mechanism independently controls position relative to the nose versus position relative to the eyes, allowing local optimization of both safety and accuracy.
Data Source
AI summary
The ophthalmic device includes a displacement mechanism configured to displace an examination head with respect to subject eyes, a drive controlling unit configured to drive the displacement mechanism to displace the examination head to an examination position for the subject eye under examination along an axis of tilt, wherein the axis of tilt is an axis obtained by tilting, around a center of the subject eye under examination, a reference axis that extends along an eye direction of the subject eye in parallel with a front-back direction serving as an operating distance direction of the examination head, outward away from a subject's nose, and a retraction controlling unit configured to, when examination on a first eye of the subject eyes by the examination head is completed, drive the displacement mechanism to retract the examination head in a direction away from a face of the subject.