Positive Visual Symptoms

The symptoms thus far described are attributed to loss of function of the axons derived from the retinal ganglion cells. Occasionally patients experience spontaneous flashes of blue, yellow or white light. Such symptoms are infrequently mentioned, and their occurrence may be more often ascertained from direct questioning. The flashes are probably attributable to abnormal excitability, which has been shown in central nerve fibers passing through a demyelinating lesion (3). As described in the following section, incomplete compressive lesions result in focal demyelination at the site of the compression.

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