... gradual, painless, severe, central visual loss in one eye, followed weeks or months later by the same process in the other eye Acutely, the optic disc appears mildly plethoric with surface capillary ... (Fig 29 -11) without a phase of acute optic disc edema Many agents have been implicated as a cause of toxic optic neuropathy, but the evidence supporting the association for many is weak The following ... (measured months after the attack), but the recovery of visual function occurs more rapidly For some patients, optic neuritis remains an isolated event However, the ONTT showed that the 10-year cumulative...