Interpretation of visual field defects respecting the vertical meridian and not related to distinct chiasmal or postchiasmal lesions

Ethambutol Chiasmal Toxicity with Bitemporal Hemianopia

“…1 As a caveat, the centrocecal scotomas may be confused with bitemporal hemianopsias. 1,13 The mechanism of optic neuropathy remains unclear. It is postulated that the toxicity is caused by a disturbance in mitochondrial metabolism.…”