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Retinal ganglion cell layer and visual function in a patient with optic disc drusen
M M Gellrich1, S Neumaier, C Auw-Hädrich
1Universitäts-Augenklink, Freiburg, Germany.
Summary
Optic disc drusen cause significant retinal ganglion cell loss, particularly in the parafoveal region. This cell loss correlates with visual field defects but not necessarily with reduced visual acuity.
Area of Science:
- Ophthalmology
- Neuroscience
- Cell Biology
Background:
- Optic disc drusen are abnormal calcifications within the optic nerve head.
- Their impact on retinal ganglion cells (RGCs) and visual function requires detailed clinicopathological correlation.
Observation:
- A quantitative clinicopathological study was performed on a patient with bilateral optic disc drusen.
- Retinal ganglion cell counts were compared between affected eyes and 10 normal retinae.
Findings:
- Significant RGC reduction was observed in both eyes with optic disc drusen (Right: 305,319; Left: 527,571) compared to normal controls (1,244,858).
- Parafoveal RGC loss was substantial (Right: 57%; Left: 36%), yet visual acuity remained relatively high (0.8 and 1.0).
- Light sensitivity loss was greatest in peripheral retina, contrasting with the highest RGC loss in the central and parafoveal areas.
Implications:
- Findings support theories on central retinal resolution and suggest visual acuity may not directly reflect RGC damage from optic disc drusen.
- Automated perimetry may underestimate the extent of retinal damage caused by optic disc drusen.