A patient with optic neuritis may developed distorted color vision (dyschromatopathis).
Patient selection: optic neuritis, including multiple sclerosis
Koellner's rule: most patient with optic neuropathy have defect in red/green discrimination. However, there are many exceptions including demyelinating optic neuritis. No single type of color defect is found consistently with optic neuritis.
Red/Green Defect
Blue/Yellow Defect
Visual Acuity
Classification of Verriest
present
none or minimal
reduced central visual acuity
I (protan like)
present
present, less severe
NA
II (deutan like)
none or minimal
mild or moderate
normal or mildly reduced
III (tritan like)
In addition the patterns reported by Verreist, nonselective defects can also occur.
The defect in color vision can change over time both in colors affected and severity.
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