Light Field Refraction Measurement for Independent Binocular Eye Testing
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Solution Overview
Problem
Existing methods for determining ocular refraction, particularly in binocular vision, fail to accurately differentiate the refraction of the right and left eyes, leading to potential anisometropia and inadequate vision correction.
Innovation Solution
A system utilizing a light field display device with a three-dimensional referential to generate independent light fields for each eye, adjusting the light fields based on optical aberrations to determine precise refraction parameters without additional lenses, and incorporating a control unit to analyze subject responses for sharpness adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional subjective refraction using trial lenses or phoropter is used, then refraction correction can be determined, but the method cannot accurately differentiate refraction of right and left eyes in binocular vision, leading to potential anisometropia
Solution Approach 1:
The display device is divided into two distinct display areas, with each area dedicated to presenting visual stimuli to a specific eye. This segmentation enables independent refraction measurement for each eye while maintaining binocular vision capability, resolving the contradiction between measurement precision and adaptability.
Solution Approach 2:
Each display area is optimized specifically for its corresponding eye, with independent optical parameters and visual stimuli. This local quality approach allows tailored refraction correction for each eye while preserving overall binocular function, enabling accurate differentiation of right and left eye refraction.
2Measurement precision
If monocular refraction is performed, then refraction can be measured for each eye separately, but accommodation occurs leading to inaccurate measurements
Solution Approach 1:
The system merges binocular vision capability with independent monocular refraction measurement. By presenting visual stimuli to both eyes simultaneously through separate display areas while allowing independent optical correction, the system eliminates accommodation issues associated with monocular testing while maintaining measurement precision.
3Ease of operation
If additional lenses are used for refraction correction, then vision correction can be provided, but the device complexity increases
Solution Approach 1:
The system replaces the mechanical trial lens system with a digital display-based optical correction mechanism. By using display areas that can present visually corrected images directly to each eye, the system eliminates the need for physical trial lenses and trial frames, reducing device complexity while maintaining vision correction capability.
4Measurement precision
If conventional phoropter with manual or automatic lens changer is used, then subjective refraction can be determined, but the resolution is limited to steps of 0.25 diopter
Solution Approach 1:
The system changes the fundamental parameter of optical power delivery from discrete lens steps to continuous digital control. By adjusting the optical power of the light field display device continuously rather than in 0.25D steps, the system achieves higher measurement precision without requiring complex lens changer mechanisms.
Data Source
AI summary
A system for determining refraction features of both first and second eyes of a subject including a light field display device, a system of localization of the positions of the first and second eyes of the subject, the light field display device generating a first light field directed selectively toward the first eye, and, respectively, a second light field directed selectively toward the second eye, control circuitry that adjusts the first light field as a function of at least a first refraction parameter associated with at least a first optical aberration for the first eye and the control circuitry adjusting said second light field as a function of at least a second refraction parameter associated with at least a second optical aberration for the second eye.