Wavefront Sensing for Dual-Meridian Ocular Aberration Mapping
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Solution Overview
Problem
Existing devices and methods for determining ocular aberrations of the eye are limited by the need for manual adjustment of the eye to different eccentricities, prolonged measurement times, and require trained professionals, making them impractical for widespread use and unable to provide a comprehensive ocular defocus map in a single measurement.
Innovation Solution
A device and method utilizing a wavefront sensing unit and diffractive elements to generate multiple diffraction orders in two meridians, allowing for automated and simultaneous measurement of ocular aberrations across different eccentricities, enabling a one-shot assessment of the ocular defocus map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single scanning meridian system is used to measure ocular aberrations, then the device complexity is reduced, but the measurement time increases and productivity decreases
Solution Approach 1:
The patent divides the measurement task into two independent scanning meridians (e.g., horizontal and vertical) that operate simultaneously. Each meridian has its own scanning system that can independently measure ocular aberrations at different eccentricities, allowing parallel processing of measurements that would otherwise require sequential scanning in a single meridian.
Solution Approach 2:
The patent transitions from a single-dimensional scanning approach (one meridian) to a two-dimensional scanning approach (two orthogonal meridians). By adding the second scanning dimension, the system can capture comprehensive ocular aberration data across different field positions simultaneously, eliminating the need to move the eye or reposition the device between measurements.
2Measurement precision
If the eye is moved to different eccentricities for measurement, then comprehensive ocular aberration data is obtained, but the measurement time increases and reliability decreases
Solution Approach 1:
The dual scanning meridian system automatically captures ocular aberration data at multiple eccentricities without requiring manual eye movement or repositioning. The system self-adjusts by scanning across different field positions in both meridians simultaneously, maintaining consistent measurement conditions while comprehensively mapping the ocular defocus map.
3Adaptability or versatility
If multiple fixation targets are used for different eccentricities, then complete ocular aberration mapping is achieved, but the device complexity and ease of operation worsen
Solution Approach 1:
The dual scanning meridian system serves multiple measurement functions simultaneously - it can measure ocular aberrations at various eccentricities, capture complete ocular defocus maps, and accommodate different field positions all through a single integrated scanning mechanism. This eliminates the need for multiple separate fixation targets or manual reconfiguration of the measurement system.
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
Enables efficient, automated measurement of ocular aberrations in two meridians, facilitating personalized optical lens production and myopia control treatments, and providing a comprehensive ocular defocus map without the need for trained professionals.
Implementation Method 1
at least one diffractive element designated for generating multiple diffraction orders in the at least one light beam in two meridians in a manner that the multiple diffraction orders are spatially separated on the wavefront sensing unit and in the at least one eye of the user
Data Source
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AI summary
The present invention relates to a device (110) and a method (210) for determining an ocular aberration of at least one eye (112) of a user, the device (110) comprising: - a wavefront sensing unit (128) designated for measuring at least one optical wavefront comprised by at least one light beam (118), wherein an ocular aberration of the at least one eye (112) of the user is determined from the at least one optical wavefront; - at least one diffractive element designated for generating multiple diffraction orders (184) in the at least one light beam (118) in two meridians in a manner that the multiple diffraction orders (184) are spatially separated on the wavefront sensing unit (128) and in the at least one eye (112) of the user wherein the device further comprises at least one additional optical path (176, 176'), wherein at least one of a fixation target (180) and a pupil camera (182) are placed in the additional optical path (176, 176').