Aberration Measurement Correcting Ocular Scattering
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Solution Overview
Problem
Current aberrometry systems using pyramid wave front sensors face errors due to ocular scattering, which makes it impossible to accurately determine the size of the retinal spot and partial derivatives of the wave front, leading to incorrect measurements, especially in abnormal eyes with conditions like cataracts.
Innovation Solution
Incorporating a method to measure and correct for ocular scattering by using a device that estimates the amount of scattering and linking it to the sensor's output through a linear regression formula, allowing for accurate calculation of aberrations by adjusting the transduction function of the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pyramid wave front sensor is used to measure aberrations, then the measurement process is simplified and the system structure is compact, but ocular scattering causes errors in determining the retinal spot size and partial derivatives of the wave front, leading to incorrect measurements
Solution Approach 1:
The patent applies preliminary action by measuring ocular scattering before performing aberration measurements. The system first quantifies the scattering properties of the ocular media, then uses this information to correct subsequent wave front measurements. This preliminary measurement of scattering allows the system to compensate for its effects during the actual aberration measurement process, resolving the contradiction between simplified sensor structure and measurement accuracy.
Solution Approach 2:
The patent implements feedback by using the measured ocular scattering information to correct the wave front sensor readings. The system continuously monitors scattering effects and feeds this information back into the measurement algorithm to compensate for scattering-induced errors. This feedback mechanism allows the simplified pyramid sensor to achieve accurate aberration measurements despite the presence of ocular scattering.
2Measurement precision
If scattering is present in ocular media, then the retinal spot size becomes unpredictable and measurement errors occur, but adding scattering measurement and correction capabilities increases device complexity
Solution Approach 1:
The patent applies universality by designing the optical system to perform multiple functions: it can measure both ocular scattering and wave front aberrations using the same optical path and sensor. The pyramid wave front sensor is configured to extract both scattering information and aberration data from the retinal image, eliminating the need for separate dedicated measurement systems. This multi-functionality reduces the overall device complexity while maintaining high measurement precision for both parameters.
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 approach improves the accuracy and reliability of aberrometry measurements by accounting for scattering, enabling the aberrometer to correctly measure aberrations even in eyes with opacity, thereby enhancing the sensitivity and precision of the system.
Implementation Method 1
ocular scattering, which makes it impossible to accurately determine the size of the retinal spot and partial derivatives of the wave front
Data Source
AI summary
The present invention refers in general to the measurement of aberrations of the optical system of a living being, in particular a human. More specifically, the invention refers to methods and systems for reconstructing a wave front and/or for building a refractive error map.