An ophthalmologist should be aware of the side effects of commonly used drugs in various eye disorders so one should have a good knowledge of ocular pharmacology starting with ethambutol it is a commonly used AT drug its ocular side effects are Change in colour vision fist it affects red and green then blue and yellow  Affection of visual fields can cause optic neuritis which is dose dependent  in literature known to cause optic atrophy but not seen in clinical practice  the drug may also cause changes in vision and refraction so when this drug has to be started visual examination should be done before and also during therapy   Chloroquine  causes bulbous eye maculopathy  Chloroquine  hydroxy chloroquine  indomethacin and madrone cause  vertex keratopathy     Steriods oral cause cataract and topical can cause glaucoma   Pilocarpine eye drops used for a long time is known to cause …