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A Comparison Between Refraction From an Adaptive Optics Visual Simulator and Clinical Refractions.
Juan Tabernero1,2, Carles Otero1, Shahina Pardhan1
1Vision and Eye Research Institute, School of Medicine, Anglia Ruskin University, Cambridge, UK.
Translational Vision Science & Technology
|August 25, 2020
Summary
The Visual Adaptive Optics (VAO) provides accurate subjective refractions, outperforming objective measures and autorefractors. Ocular conditions significantly impact the accuracy of all refractive methods.
Area of Science:
- Ophthalmology
- Optometry
- Optical Engineering
Background:
- Adaptive optics (AO) technology offers potential for advanced visual function assessment.
- The Visual Adaptive Optics (VAO) system integrates a Hartmann-Shack aberrometer for objective and subjective refraction.
- Accurate refractive error measurement is crucial for vision correction and eye health management.
Purpose of the Study:
- To compare the accuracy of subjective and objective refractions obtained with the VAO system.
- To evaluate the performance of the VAO against a commercial autorefractometer and a clinical subjective refraction.
- To investigate the influence of age, refractive error type, and ocular diseases on refraction accuracy.
Main Methods:
- Refractive error was measured in 469 participants using VAO subjective, VAO objective, autorefraction, and clinical subjective refraction.
- Data were analyzed using power vectors, mean spherical equivalent, and Jackson-Cross-Cylinder measures.
- Agreement was assessed using 95% intervals of agreement, with covariates including age, refractive error, and ocular disease presence.
Main Results:
- VAO subjective refraction showed better agreement with clinical subjective refraction (median difference +0.13 D, agreement interval 1.80 D) compared to VAO objective (+0.38 D, 1.80 D) and autorefraction (-0.38 D, 2.10 D).
- Accuracy differences were more pronounced in participants with ocular conditions, where autorefraction agreement interval widened significantly to 4.80 D.
- The presence of ocular conditions negatively impacted the accuracy of all tested refraction methods.
Conclusions:
- VAO subjective refraction demonstrates superior accuracy compared to VAO objective and autorefraction.
- Refractive accuracy is influenced by the presence of ocular conditions, which generally decrease precision.
- The VAO system shows promise for improving refraction accuracy and efficiency, warranting further development.
