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Relationship Between Flicker Modulation Sensitivity and Retinal Ganglion Cell Related Layer Thicknesses
María J Pérez-Carrasco1, Jesús Carballo-Álvarez2, John L Barbur2
1Applied Vision Research Group, Faculty of Optics and Optometry, Universidad Complutense de Madrid, Madrid, Spain.
Translational Vision Science & Technology
|October 14, 2021
Summary
Peripapillary retinal nerve fiber layer thickness predicts parafoveal flicker sensitivity in healthy eyes. This finding may lead to earlier detection of retinal neurodegenerative diseases.
Area of Science:
- Ophthalmology
- Neuroscience
- Retinal Imaging
Background:
- Early detection of retinal ganglion cell (RGC) damage is crucial for managing neurodegenerative diseases.
- Current measurement methods for RGCs and visual function have limited sensitivity due to natural variability.
Purpose of the Study:
- To investigate the relationship between RGC-related layer thicknesses and flicker modulation sensitivity (FMS) in healthy subjects.
- To explore these relationships across different light conditions (photopic and mesopic) and retinal locations (foveal and parafoveal).
Main Methods:
- Measured photopic and mesopic FMS in 56 healthy young adults at fixation and 5-degree eccentricity.
- Utilized spectral-domain optical coherence tomography (SD-OCT) to assess retinal layer thicknesses.
- Analyzed correlations between FMS and retinal thickness, adjusting for confounding factors.
Main Results:
- Parafoveal inner retinal layer (IRL) thickness predicted both photopic and mesopic parafoveal FMS.
- Peripapillary retinal nerve fiber layer (pRNFL) thickness in one region predicted FMS in the opposite parafoveal region under both light conditions.
Conclusions:
- pRNFL thickness is a significant predictor of parafoveal FMS in both mesopic and photopic conditions in healthy eyes.
- Combining pRNFL thickness with parafoveal flicker sensitivity may offer a more sensitive biomarker for early neurodegenerative changes.
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