Forehead Rest Edge Geometry for Slit Lamp Alignment
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Solution Overview
Problem
Existing slit lamp microscopes face issues with forehead misalignment during eye examinations, leading to improper optical axis alignment and potential movement of the subject's face, which affects accurate observation of the eye region.
Innovation Solution
A forehead rest with angled edge portions that provide tactile feedback to the user, allowing easy alignment of the forehead with the proper position, featuring a forehead-contacting face and left and right edge-forming faces that adjust their angle relative to the forehead based on alignment, enhancing the user's recognition of misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional forehead rest is used, then the structure is simple, but the subject's forehead alignment precision deteriorates
Solution Approach 1:
The forehead rest incorporates edge portions that provide tactile feedback to the subject when the forehead is misaligned. The edge portions are designed to contact the forehead at specific angles that indicate improper positioning, allowing the subject to self-correct the alignment without external intervention or complex electronic sensors.
Solution Approach 2:
The forehead rest utilizes visual contrast through its geometric design, where the edge portions create distinct contact patterns with the forehead. When properly aligned, the contact points follow a specific pattern that visually confirms correct positioning to both the subject and examiner.
2Ease of operation
If the forehead rest has no alignment guidance features, then the device complexity is low, but the ease of operation deteriorates
Solution Approach 1:
The forehead rest enables the subject to self-align their forehead correctly through tactile feedback from the edge portions. The design allows the subject to independently adjust their position based on the contact sensations, eliminating the need for examiner assistance or complex adjustment mechanisms.
Solution Approach 2:
The edge portions are designed with asymmetric angles relative to the forehead-contacting face, creating different tactile sensations for left and right misalignments. This asymmetric design provides directional guidance to the subject, making it intuitive to understand which direction to adjust for proper alignment.
3Reliability
If the forehead rest lacks edge portions, then the structure is simpler, but the reliability of optical axis alignment deteriorates
Solution Approach 1:
The edge portions provide continuous tactile feedback during the positioning process, ensuring that the subject achieves and maintains proper alignment. This feedback mechanism increases the reliability of optical axis alignment by preventing misalignment that would otherwise go undetected.
Solution Approach 2:
The edge portions are designed to provide preliminary alignment guidance before the subject's forehead fully contacts the forehead-contacting face. This preliminary action ensures that the subject is already in the correct alignment trajectory, increasing the likelihood of achieving proper optical axis alignment.
Data Source
AI summary
A forehead rest which is provided in an ophthalmic device (a slit lamp microscope) and against which a forehead of a subject is to be put includes: a forehead-contacting face which is to contact the forehead and left and right edge-forming faces which connect to two end sides in a left-right direction (X direction) of the forehead-contacting face to form left and right edge portions on the two end sides of the forehead-contacting face between the edge-forming faces and the forehead-contacting face.