Moving Visual Targets for Natural Eye Accommodation Control
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Solution Overview
Problem
Existing methods for limiting accommodation during refraction determination, such as using fogging lenses or cycloplegic eye drops, are uncomfortable and artificial, failing to maintain a natural vision situation and risking ocular reactions.
Innovation Solution
A method involving displaying an environmental scene with a target that appears to move towards or away from the subject, using optical systems to control accommodation naturally, without artificial blurring, through techniques like varying target size, position, or disparity in stereoscopic displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fogging lenses or cycloplegic eye drops are used to limit accommodation, then accommodation control is achieved, but visual comfort deteriorates and artificial blurring occurs
Solution Approach 1:
The patent introduces an intermediary visual stimulus (moving target in environmental scene) that mediates between the subject and the accommodation control mechanism. Instead of directly blurring vision with fogging lenses or drops, the system uses a controlled visual task that naturally induces accommodation changes, thereby maintaining comfort while achieving control.
Solution Approach 2:
The patent replaces the mechanical/chemical systems (fogging lenses, eye drops) with an optical display system that uses visual perception principles. By displaying a target that appears to move towards or away from the subject, the system substitutes physical accommodation limitation with a controlled visual stimulus that elicits natural accommodation responses.
2Reliability
If cycloplegic eye drops are used to inhibit accommodation, then accommodation limitation is achieved, but ocular reactions and discomfort increase
Solution Approach 1:
The patent replaces the chemical system (cycloplegic eye drops) with an optical display system. Instead of using pharmacological agents that cause ocular reactions, the system uses a visually presented moving target to naturally induce accommodation changes, thereby eliminating harmful chemical effects while maintaining accommodation control.
Solution Approach 2:
The moving target in the environmental scene serves as an intermediary that triggers natural accommodation responses without requiring direct chemical contact with the eye. This intermediary visual stimulus achieves accommodation control through physiological visual processing rather than pharmacological action.
3Reliability
If fogging lenses are used to induce myopic situation, then accommodation is limited, but natural vision situation is lost
Solution Approach 1:
The patent employs dynamic visual stimuli where the target appears to move towards or away from the subject within an environmental scene. This dynamic presentation maintains the natural vision situation by requiring the subject to track and focus on the moving target, thereby preserving comfortable natural vision while achieving controlled accommodation changes.
Solution Approach 2:
The patent substitutes the static fogging lens system with a dynamic visual display system. Instead of creating artificial blurring that eliminates natural vision, the system uses controlled motion and depth cues in a display environment to naturally elicit accommodation responses, thereby maintaining adaptability to natural vision situations.
Data Source
AI summary
A method for inducing a controlled variation of accommodation in an eye of a subject, using an optical system arranged in front of at least one eye of the subject and including displaying an environmental scene, displaying, in this environmental scene, a target visible by the subject through said optical system, said target being displayed in such a way that it is perceived by the subject as moving away from said subject or moving towards said subject within said environmental scene, having the subject observe said moving target.