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Color-fluorescein relationship in glaucomatous optic nerve damage
1Department of Ophthalmology, Kobe University School of Medicine, Japan.
Japanese Journal of Ophthalmology
|January 1, 1995
Summary
Quantitative image analysis revealed that optic disc color and fluorescein intensity are reduced in glaucoma patients, correlating with visual field defects. These findings suggest different pathological mechanisms in primary open-angle glaucoma and normal-tension glaucoma.
Area of Science:
- Ophthalmology
- Medical Imaging
- Glaucoma Research
Background:
- Glaucoma is a leading cause of irreversible blindness worldwide.
- Optic disc damage is a hallmark of glaucoma, impacting visual function.
- Understanding the quantitative characteristics of the optic disc in different glaucoma types is crucial for diagnosis and management.
Purpose of the Study:
- To quantitatively evaluate optic disc color (%R) and fluorescein intensity (%F) using computerized image analysis in patients with primary open-angle glaucoma (POAG) and normal-tension glaucoma (NTG).
- To correlate these quantitative measures with the severity of visual field defects in POAG and NTG.
- To compare these parameters between POAG, NTG, and normal controls.
Main Methods:
- Computerized image analysis was employed to measure optic disc color (%R) and fluorescein intensity (%F).
- A cohort of 23 POAG patients, 22 NTG patients, and 11 normal controls were studied.
- Correlation analyses were performed between %R, %F, and the stage of visual field defects.
Main Results:
- Both %R and %F were significantly lower in eyes with more severe visual field defects in both POAG and NTG groups (correlation coefficients ranging from 0.652 to 0.897, all P < 0.001).
- %R was significantly lower in early-stage POAG and NTG compared to controls (P < 0.05), with no significant difference between POAG and NTG.
- %F was lower in both glaucoma groups compared to controls (P = 0.001), and was significantly lower in NTG than in POAG (P = 0.01).
Conclusions:
- Optic disc color and fluorescein intensity are quantitatively reduced in glaucoma and correlate with visual field loss.
- While early-stage POAG and NTG show similar reductions in optic disc color, fluorescein intensity is more severely reduced in NTG.
- The differing correlation patterns between optic disc color and fluorescein intensity in POAG and NTG suggest distinct underlying pathological mechanisms for optic nerve damage in these conditions.