Phoropter Active Lens Temperature Compensation
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Solution Overview
Problem
Active lenses in phoropters experience shifts in optical power due to temperature variations, leading to discrepancies between actual and expected optical power, which existing technologies fail to effectively correct.
Innovation Solution
A process involving a temperature sensor to measure and correct the optical power of active lenses by using static and dynamic curves or functions to adjust the optical power control command, ensuring the actual optical power aligns with the expected power, even under temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a tunable active lens is used to replace mechanical lens sets, then device complexity is reduced and ease of operation is improved, but optical power accuracy deteriorates due to temperature-induced shifts
Solution Approach 1:
The patent implements a feedback mechanism by measuring the actual optical power of the active lens and comparing it with the expected optical power. Based on the deviation detected, the system automatically adjusts the control command to the active lens, creating a closed-loop control system that compensates for temperature-induced optical power shifts and maintains measurement accuracy.
Solution Approach 2:
The patent changes the control parameter from a fixed control command to a dynamically adjusted command based on temperature conditions. By introducing temperature as a variable parameter and establishing correction curves that relate temperature deviations to optical power deviations, the system adapts the control command to maintain accurate optical power despite temperature variations.
2Ease of operation
If active lens optical power is adjusted without temperature compensation, then ease of operation is improved, but measurement precision deteriorates due to temperature shifts
Solution Approach 1:
The system continuously monitors the actual optical power and feeds this information back to the control system. The feedback loop compares measured optical power with expected values and automatically adjusts the control command, enabling the system to maintain measurement precision while preserving the ease of operation provided by electronic control.
Solution Approach 2:
The patent performs preliminary characterization of the active lens by measuring optical power at various temperatures and storing correction curves in advance. During actual operation, the system retrieves and applies the appropriate correction based on current temperature, eliminating the need for real-time complex calculations while maintaining measurement accuracy.
3Manufacturing precision
If temperature compensation is implemented using static curves, then optical power accuracy is improved, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The patent replaces complex mechanical lens adjustment mechanisms with an electronic control system that uses software-based compensation algorithms. By substituting mechanical complexity with electronic processing and mathematical correction curves, the system achieves high optical power accuracy while maintaining relatively simple hardware architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process effectively stabilizes the optical power of active lenses, ensuring accurate refraction measurements by compensating for temperature-induced shifts, thereby improving the reliability of phoropter operations.
Implementation Method 1
a temperature sensor is arranged in the phoropter to measure the temperature in the phoropter
Implementation Method 2
The optical power of such an active lens is changed according to the deformation of a deformable membrane, e.g. an elastic polymer membrane, under the action of an actuator
Implementation Method 3
the variable optical power of the lens then depends on the shape of the membrane, and on the optical properties (e.g. indices of refraction) of the transparent fluid filling the active lens. Hence, depending on the temperature acting on the different parts of the active lens and notably its internal liquid
Data Source
AI summary
A process, phoropter, and an optometry system, the process being for correction of the shift of the optical power of an active lens in a phoropter due to a temperature change over time, the active lens including a container filled with a liquid and having a deformable curvature membrane under the action of an actuator controlled by an optical power control command, the shift being that the active lens provides an actual optical power that is different from the expected optical power corresponding to the optical power control command. A temperature sensor is arranged in and/or on the phoropter to measure the temperature in the phoropter.