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.
Classification of Verriest
none or minimal
reduced central visual acuity
I (protan like)
present, less severe
II (deutan like)
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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