Dynamic Retinal Image Quality Measurement
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Solution Overview
Problem
Current wavefront aberrometers do not accurately account for the dynamic nature of the human eye and binocular vision, leading to suboptimal refractive prescriptions, as they fail to consider accommodation and distance vision effectively, and most devices cannot simultaneously acquire dynamic wavefront aberration data from both eyes.
Innovation Solution
A method and system that utilize a wavefront sensor to capture and process images from both eyes sequentially, determining image quality metrics and refractive aberrations to provide a composite refractive prescription, incorporating dynamic and binocular information, and allowing for open-view measurements to enhance vision care by optimizing refractive corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a standard wavefront aberrometer is used to obtain objective refraction, then the measurement process is quick and automated, but the prescription accuracy is insufficient because it ignores dynamic eye behavior and accommodation
Solution Approach 1:
The system transitions from static wavefront measurements to dynamic sequential imaging that captures the eye in multiple states (different accommodation levels, different fixations). The eye is imaged sequentially at different times rather than simultaneously, allowing capture of dynamic behavioral states while maintaining measurement precision through multiple snapshots of eye behavior
Solution Approach 2:
The system employs periodic alternating imaging of the two eyes with different fixation targets, creating a rhythmic measurement sequence. This periodic action allows the system to capture accommodation responses and binocular interactions systematically through repeated measurement cycles
2Loss of information
If dynamic wavefront aberration data is acquired from both eyes simultaneously, then binocular vision information is captured, but most existing devices lack this capability and the system complexity increases
Solution Approach 1:
The measurement process is segmented into separate sequential imaging events for each eye, rather than attempting simultaneous capture. Each eye is imaged independently with its own fixation target, allowing the system to process binocular information through time-separated measurements that are later integrated
Solution Approach 2:
Different fixation targets are introduced as intermediaries to stimulate specific accommodation responses from each eye. These targets serve as mediators that elicit the desired dynamic eye behaviors, allowing the system to capture binocular interaction information indirectly through the eyes' responses to the targets
3Measurement precision
If closed-view measurement is used, then the measurement process is simplified, but distance vision estimates are inaccurate because the eye is not in a natural viewing state
Solution Approach 1:
The system transitions from static closed-view measurements to dynamic open-view measurements where the patient naturally views distant targets through the device. This allows the eye to remain in a natural unaccommodated state for distance vision assessment, capturing realistic viewing conditions rather than artificial measurement conditions
Data Source
AI summary
A method of providing a refractive prescription includes: receiving a plurality of images from a sensor, the plurality of images captured sequentially using light from an eye of a living being: determining respective values of an image quality metric (IQM) for respective images of the captured plurality of images: selecting a subset of the plurality of images based on the values of the IQM; and determining and outputting to a user a refractive prescription for the eye based on the subset of the plurality of images. Example embodiments can be employed to produce and output better refractive prescriptions by taking into account dynamics of a patient's eye.