Ethambutol
> 15mg/kg. 3-6 months. bi central blurring. normal or slightly swollen, splinter hemor, red-green dyschromatopsia, prolonged recovery
Vigabatrin
bi concentric, nasal visual field constriction. photoreceptor and ganglion cell damage. >3kg. changes persist.
Methotrexate
acute or gradual visual loss