Vision-Compensating Device with Distance-Aware Optical Correction
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Solution Overview
Problem
Current visual compensation devices for subjective refraction require trial and error to achieve desired optical correction values, as they do not accurately account for the spacing between optical components, leading to inefficient correction processes.
Innovation Solution
A visual compensation device with a module that determines commands for spherical and cylindrical corrections based on a model considering the distance between optical components, allowing for precise adjustment of optical corrections to match desired setpoints, using a combination of lenses with variable spherical power and cylindrical corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lens with variable spherical power and an optical assembly with cylindrical correction are used without considering the distance between them, then the device structure is simple, but the optical correction precision deteriorates due to unaccounted coupling phenomena
Solution Approach 1:
The patent pre-calculates and stores correction values in a lookup table that compensates for coupling phenomena between the lens and optical assembly. This preliminary computation of correction factors based on known distances eliminates the need for complex real-time calculations, thereby improving optical correction precision without significantly increasing device complexity during operation.
Solution Approach 2:
The patent introduces a correction value lookup table as an intermediary between the raw optical measurements and the final correction output. This lookup table pre-computes the effects of coupling phenomena, allowing the system to achieve high precision corrections without directly implementing complex real-time coupling calculations, thus balancing precision and complexity.
2Productivity
If trial and error method is used to find visual correction values, then the device operation is simple, but the time required for subjective refraction increases
Solution Approach 1:
The patent pre-computes and stores optimal correction values in a lookup table based on the desired optical corrections and known distances between components. During subjective refraction, the system directly retrieves the appropriate correction values from this pre-computed table, eliminating the need for time-consuming trial and error adjustments and significantly improving refraction efficiency.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors the current optical correction state and automatically adjusts the lens and optical assembly positions based on predefined correction algorithms. This closed-loop control eliminates manual trial and error by providing real-time feedback-driven adjustments, thereby reducing the time required for subjective refraction.
3Measurement precision
If the distance between lens and optical assembly is not considered in command determination, then the control system is simple, but the accuracy of achieving desired setpoint values deteriorates
Solution Approach 1:
The patent pre-calculates correction values that account for the distance between the lens and optical assembly and stores them in a lookup table. When a desired setpoint is input, the system retrieves the pre-computed correction values that already compensate for the coupling effects of the specific distance, achieving high setpoint accuracy without implementing complex real-time distance-based calculations.
Solution Approach 2:
The patent changes the control approach from direct positioning to using pre-computed correction values that are functions of the distance parameter. By storing correction values indexed by distance in a lookup table, the system achieves accurate setpoint achievement while keeping the control logic simple - it only needs to retrieve and apply the appropriate correction values based on the current distance configuration.
Data Source
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Figure 3~6
AI summary
A vision-compensating device allowing observation along an optical axis (X)of observation with an optical correction of variable power comprises a lens (6) having, along the optical axis, a spherical power that is variable as a function of a first control, and an optical assembly (2, 4) generating, along the optical axis, a cylindrical correction that is variable as a function of at least one second control applied to said optical assembly (2, 4). The vision-compensating device also comprises a module for receiving at least one setpoint for said optical correction and a module for determining the first control and the second control depending on said setpoint by means of a mode taking into account the distance (β2) separating said lens (6) and said optical assembly (2,4). A method for controlling a vision-compensating device and a binocular optometry device are also proposed.