Visual Field Testing System with Motor-Driven Eye Alignment
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Solution Overview
Problem
Existing visual field testing devices face challenges in accurately aligning a patient's eye with the refractive correction element, leading to misalignment during testing, which results in poor gaze monitor performance, trial lens artifacts, and degraded retinal sensitivity measurements.
Innovation Solution
A visual field testing system that includes a patient support, a refractive correction element, a motor, a camera, and a processor to automatically align the patient's eye with the refractive correction element by determining the relative displacement and adjusting the position to minimize separation distance between the eye and the lens center, continuously re-centering the eye throughout the test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a technician manually positions the patient's eye using live video feedback, then the initial alignment can be achieved, but the alignment becomes inaccurate due to patient movement during testing
Solution Approach 1:
The system continuously captures images of the patient's eye and lens position, processes this visual information to determine relative displacement, and uses this feedback to dynamically adjust the lens position via motor actuation, maintaining accurate alignment throughout the extended testing period
Solution Approach 2:
The system transitions from static manual positioning to dynamic automatic adjustment, where the lens position is continuously modified in real-time based on detected eye position changes, allowing the system to adapt to patient movement during the test
2Measurement precision
If liquid trial lenses are used for refractive correction, then refraction accuracy is improved, but the system becomes more sensitive to eye-lens misalignment
Solution Approach 1:
The system continuously monitors eye position relative to the liquid trial lens and provides real-time feedback through motor actuation to maintain precise alignment, compensating for the high sensitivity of liquid lenses to misalignment and ensuring reliable gaze monitor performance
Solution Approach 2:
The system replaces manual mechanical positioning with automated motor-driven adjustment, providing more precise and stable control of lens position relative to the eye, thereby ensuring consistent alignment despite the sensitivity of liquid trial lenses
3Productivity
If the patient's eye is misaligned with the refractive correction lens, then testing can still proceed, but measurement accuracy degrades due to stimulus blur and lens artifacts
Solution Approach 1:
The system performs preliminary automatic alignment of the eye with the refractive correction lens before initiating the visual field test, ensuring that measurements are not degraded by misalignment artifacts or stimulus blur from the outset
Solution Approach 2:
The system continuously monitors alignment during testing and dynamically adjusts the lens position to maintain optimal alignment, preventing measurement degradation due to patient movement or drift during the test procedure
Data Source
AI summary
Systems and methods for performing a visual field test of a patient are described. One example method for performing the visual field test of the patient using a visual field testing device having a refractive correction element, a patient support, and a motor operably attached to one of the refractive correction element or the patient support includes positioning the patient's head relative to the device using the patient support. An image showing the position of the eye relative to the refractive correction element is collected. The relative displacement of the eye with respect to the refractive correction element is determined based on the collected image. The motor is actuated in a manner to reduce the determined displacement. A series of test stimuli is displayed to the patient's eye and responses to the test stimuli are received from the patient. The responses are analyzed to make an assessment of the patient's visual field.