Optic nerve trauma: clinical, electrophysiological and histological remarks.

18 patients with post-traumatic visual disease of the optic nerve are presented. In the post-traumatic stage, visual evoked potentials were monitored. In amaurosis there was a high incidence of midface or frontobasal fractures. The severity of the trauma is not correlated with the severity of visual deficits. Flash evoked potential (FEP) findings were different: In most cases there was a correlation of clinical and FEP findings. In some we found false positive potentials in the acute stage. In smaller visual field deficits the alterations of FEP could not be correlated with the clinical disorders. FEP alterations depended on time. The pathophysiological mechanisms are discussed in regard to the pathological findings in 51 unselected autopsies with an investigation of the visual pathway from the intraorbital optic nerve to the visual cortex. Because of the different morphological alterations the clinical, neurological and ophthalmological examination should be followed by standard CT scanning to evaluate intracranial haematomas and by CT scanning with thin slices of the optic nerves and the soft tissue of the orbit. Visual evoked potentials (VEP) and in the unconscious patient, flash evoked potentials (FEP) do not give much more security for therapeutic decisions in comparison with former times. The histological findings do not support the hypothesis that operative decompression is successful.