<prompt> In a patient presenting with headache and eye complaints, Examination of right eye reveals: Right eye superotemporal quadrantanopia. Left eye reveals: Left eye superotemporal quadrantanopia, Left eye centrocecal scotoma. Likely site of lesion is -Left optic nerve chiasmaLeft optic tract chiasmaRight optic nerve chiasmaRight optic tract chiasma  <response>: The patient has :-Right superotemporal quadrantanopiaLeft superotemporal quadrantanopiaLeft centrocecal scotoma Left optic nerve involvement e.g. toxic opic neuropathyIt has also been explained that early central chiasmatic lesion due to pituitary adenoma can cause upper temporal quadrantanopia.So, best answer here is a i.e. left optic nerve with optic chiasma. 