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High-resolution imaging of gunn's dots
Michel Paques1, Chahira Miloudi, Caroline Kulcsar
1Clinical Investigation Center 1423, INSERM & University Pierre et Marie Curie-Paris6; and *Institut d'Optique Graduoate School, Palaiseau, France.
Retina (Philadelphia, Pa.)
|August 1, 2014
Summary
Gunn's dots, small retinal structures, are anisotropic and decrease with age. Their characteristics suggest a possible origin from hyalocytes, not Müller cells, warranting further research for potential disease biomarker applications.
Area of Science:
- Ophthalmology
- Retinal Imaging
- Cell Biology
Background:
- Gunn's dots are glistening whitish dots observed in healthy fundi, particularly in young individuals.
- They are commonly but perhaps incorrectly attributed to Müller cell footplates.
- Little scientific literature exists on Gunn's dots despite their potential as retinal disease biomarkers.
Purpose of the Study:
- To analyze the localization, density, and shape of Gunn's dots in healthy subjects.
- To investigate the optical properties and potential cellular origin of Gunn's dots.
Main Methods:
- Scanning laser ophthalmoscope reflectance imaging was used.
- Adaptive optics infrared flood imaging was performed on 18 healthy subjects (age 18-58).
Main Results:
- Gunn's dots were most visible in the midperipheral retina along temporal vessels.
- Dot reflectance showed directional variability, mirroring the inner limiting membrane.
- Mean diameter was 13.3 µm; density peaked at ~120/mm² and declined with age.
Conclusions:
- Gunn's dots are anisotropic structures located near the inner limiting membrane.
- Their characteristics align more with hyalocytes than Müller cells.
- Further research is needed to confirm their origin and utility as biomarkers for retinal diseases.
