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Peripheral Choroidal Response to Localized Defocus Blur: Influence of Native Peripheral Aberrations
Dibyendu Pusti1, Nimesh B Patel1, Lisa A Ostrin1
1College of Optometry, University of Houston, Houston, Texas, United States.
Investigative Ophthalmology & Visual Science
|April 5, 2024
Summary
Peripheral choroidal thickness changes indicate peripheral defocus blur, especially with aberrations. This finding highlights peripheral blur
Area of Science:
- Ophthalmology
- Retinal Physiology
- Visual Optics
Background:
- Peripheral defocus blur is implicated in myopia progression.
- Understanding the eye's response to peripheral defocus is crucial for visual science.
- Peripheral aberrations may influence the detection of defocus signals.
Purpose of the Study:
- To investigate the short-term peripheral choroidal thickness (PChT) response to myopic and hyperopic defocus.
- To determine the role of native peripheral aberrations in modulating the PChT response to defocus.
- To assess if PChT changes can serve as an indicator of peripheral defocus.
Main Methods:
- Peripheral myopic and hyperopic defocus were induced in 11 young adults using adaptive optics.
- Peripheral choroidal thickness was measured using Optical Coherence Tomography (OCT) during defocus exposure and recovery.
- Automated segmentation and statistical analysis quantified PChT changes under different optical conditions (with and without peripheral aberration correction).
Main Results:
- Uncorrected peripheral defocus (NoAO) induced significant bidirectional PChT changes: thickening with myopic defocus and thinning with hyperopic defocus.
- Correcting peripheral aberrations (AO defocus) abolished significant PChT alterations.
- PChT returned to baseline levels after defocus removal, and the fovea showed no significant changes, indicating a localized response.
Conclusions:
- Peripheral choroidal thickness changes effectively signal the presence of peripheral myopic and hyperopic defocus.
- Peripheral aberrations play a critical role in the eye's ability to detect peripheral defocus.
- PChT response can be utilized as a biomarker for peripheral defocus detection.
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