Accommodation Compensation in Ocular Wavefront Measurement
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Solution Overview
Problem
Current ocular wavefront measurement techniques face inaccuracies due to instrument myopia, where the eye accommodates excessively when viewing through optical instruments, leading to incorrect refraction measurements, and it is challenging to determine the accommodation state of the eye, especially for inexperienced operators.
Innovation Solution
The development of systems and methods to compensate for voluntary accommodation during wavefront measurements by obtaining induced metrics for different accommodation states, determining natural metrics, and adjusting optical treatment shapes based on accommodation characteristics to improve the accuracy of ocular aberration measurements and customize vision correction treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the eye views through an optical instrument such as a refractometer or aberrometer, then the measurement can be obtained, but the eye accommodates excessively causing instrument myopia and inaccurate refraction measurements
Solution Approach 1:
The system performs preliminary measurements of ocular aberrations at multiple accommodation states before determining the final refraction. By obtaining wavefront data at both accommodated and unaccommodated states, the system can identify and eliminate the influence of instrument myopia, allowing accurate refraction measurement even when the eye naturally accommodates during instrument viewing.
Solution Approach 2:
The system uses feedback from multiple wavefront measurements taken at different accommodation states to determine the accurate refraction. By analyzing the relationship between aberrations at accommodated and unaccommodated states, the system calculates the true refraction value, compensating for the harmful effect of instrument myopia through iterative measurement and comparison.
2Measurement precision
If accommodation elimination techniques such as fogging or distant target viewing are used, then instrument myopia should be reduced, but it is difficult to determine whether the eye is adequately accommodated, especially for inexperienced operators
Solution Approach 1:
The system automatically determines the accommodation state by analyzing wavefront aberration data without requiring operator judgment. The computer processes the ocular aberration measurements and automatically identifies whether the eye is accommodated or unaccommodated, eliminating the need for operator experience and subjective assessment while maintaining high accuracy.
Solution Approach 2:
The system replaces the mechanical and subjective method of accommodation assessment (relying on operator judgment and clinical experience) with an automated optical measurement system. By using wavefront sensing and computer analysis, the system objectively determines accommodation state, removing the dependency on operator skill level and providing consistent, reliable results.
3Measurement precision
If multiple wavefront measurements are taken at different accommodation states, then the accuracy of ocular aberration measurement can be improved, but the measurement process becomes more time-consuming
Solution Approach 1:
The system merges multiple wavefront measurements taken at different accommodation states into a single integrated analysis. By combining the data from both accommodated and unaccommodated measurements and processing them together through computer algorithms, the system achieves high measurement accuracy without requiring separate, sequential analysis of each state, thereby reducing overall measurement time.
Data Source
AI summary
Methods and systems for obtaining an ocular aberration measurement of an eye of a patient are provided. Exemplary techniques involve obtaining a first induced metric for the eye that corresponds to a first accommodation state of the eye, obtaining a second induced metric for the eye that corresponds to a second accommodation state of the eye, and determining a natural metric of the eye based on the first and second induced metrics. An induced metric may include a pupil size or a spherical aberration. Techniques can also include determining a target metric for the eye base on the natural metric, determining whether an actual metric of the eye meets the target metric, obtaining an ocular aberration measurement of the eye if the actual metric meets the target metric, and determining a treatment for the eye based on the ocular aberration measurement.