Adjacent Eye Chart Layout for Faster Ophthalmic Refraction Exams
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Solution Overview
Problem
Conventional ophthalmologic apparatuses require time-consuming and cumbersome exchanges between far-vision and near-vision visual targets due to their separate presentation, leading to inefficiencies in examination processes.
Innovation Solution
The apparatus incorporates a first and second visual target presenting unit that displays far-vision and near-vision eye charts adjacently within the viewable range of the examinee's eye through a trial lens, allowing simultaneous or alternating examinations without physical repositioning of the visual targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate visual target presenting devices are used for far-vision and near-vision examinations, then each examination can be conducted with dedicated equipment, but the exchange between far-vision and near-vision visual targets requires time-consuming manual repositioning
Solution Approach 1:
The patent combines far-vision and near-vision visual target presenting units into a single integrated apparatus. Both visual targets are displayed on the same display device at different positions, allowing the examinee to view both far-vision and near-vision targets without physical repositioning of equipment. This merging eliminates the time-consuming exchange process while maintaining the reliability of separate examination functions.
Solution Approach 2:
The patent transitions from a one-dimensional sequential presentation (switching between far and near targets) to a two-dimensional simultaneous presentation (displaying both targets at different positions on the display). The far-vision visual target is displayed at a first position and the near-vision visual target at a second position, allowing the examinee to shift between them by changing line-of-sight direction rather than requiring physical movement of targets.
2Device complexity
If manual repositioning of visual targets is required for switching between far-vision and near-vision examinations, then examination equipment can be simple in structure, but the operation becomes cumbersome and reduces examination efficiency
Solution Approach 1:
The patent replaces the mechanical repositioning system (manual movement of physical visual targets) with an electronic display system. Both far-vision and near-vision visual targets are presented as electronic images on a display device, eliminating the need for mechanical adjustment mechanisms while significantly improving ease of operation. The examinee simply changes line-of-sight direction to switch between targets.
3Adaptability or versatility
If visual targets are presented at different distances for far-vision and near-vision examinations, then each examination type can be performed independently, but the need to alternate between them creates operational delays
Solution Approach 1:
The patent enables continuous examination by allowing the examinee to alternately view far-vision and near-vision visual targets without interruption. Both targets are simultaneously available on the display, and the examinee can switch between them by changing line-of-sight direction, eliminating the breaks and repositioning delays that would otherwise occur during alternating examinations.
Data Source
AI summary
An ophthalmologic apparatus includes a first visual target presenting unit that presents a first eye chart including a visual target, at a first examination distance, to an examinee's eye of which a trial lens is disposed ahead, and a second visual target presenting unit that presents a second eye chart including a visual target, at a second examination distance different from the first examination distance, wherein the first eye chart and the second eye chart are presented adjacently in plan view in a presentation region in which no influence of aberration of the trial lens is present, within a range viewable by the examinee's eye through the trial lens.