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Color vision deficit in normal-tension glaucoma eyes
J Yamagami1, N Koseki, M Araie
1Section of Ophthalmology, JR Tokyo General Hospital, Japan.
Japanese Journal of Ophthalmology
|January 1, 1995
Summary
Normal-tension glaucoma (NTG) and primary open-angle glaucoma (POAG) show distinct color vision deficits in spared visual fields. Blue-yellow abnormalities are more common in POAG, suggesting different disease pathways.
Area of Science:
- Ophthalmology
- Neuroscience
- Vision Science
Background:
- Glaucoma is a leading cause of irreversible blindness.
- Normal-tension glaucoma (NTG) and primary open-angle glaucoma (POAG) are common subtypes.
- Understanding differences in their pathogenesis is crucial for effective management.
Purpose of the Study:
- To compare color vision deficits between NTG and POAG.
- To investigate the role of blue-yellow color vision in early-stage glaucoma.
- To explore potential differences in the pathogenesis of NTG and POAG.
Main Methods:
- Color perimetry was used to assess color vision in 26 NTG eyes and 21 POAG eyes.
- Subjects had early-stage glaucoma with visual field defects in one hemifield.
- Conventional white-on-white perimetry determined visual field status and mean deviation (MD).
Main Results:
- No significant differences in age, refraction, or MD between NTG and POAG groups.
- Blue-yellow color vision abnormalities were significantly less frequent in the spared hemifield of NTG eyes (11%) compared to POAG eyes (52%).
- Approximately 75% of eyes in both NTG and POAG groups exhibited blue-yellow abnormalities in the damaged hemifield.
Conclusions:
- Color vision deficits, particularly blue-yellow abnormalities in the spared hemifield, differ between NTG and POAG.
- These findings suggest distinct pathophysiological mechanisms underlying NTG and POAG.
- Further research into glaucoma pathogenesis may benefit from analyzing specific visual field defects.