Canalis opticus syndrome    190

General: Loss of vision after blunt trauma to the head (mainly forehead) without direct eye injury; thought to occur because of sudden stretching of the fixed, as well as the movable, portions of the optic nerve during movement of the brain at the time of injury.

Ocular: Spontaneous unilateral or bilateral, reversible or irreversible amaurosis; absent pupil reaction in cases of complete blindness; spontaneous visual recovery has been reported anecdotally.

Clinical: Blunt head injury.

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Wolin MJ, Lavin PJM. Spontaneous visual recovery from traumatic optic neuropathy after blunt head injury. Am J Ophthalmol 1990; 109:430.