anopsia anopsia an anopsia (from ancient greek ἀν- (an-) 'without', and ὄψις (opsis) 'sight') is a defect in the visual field. if the defect is only partial, then the portion of the field with the defect can be used to isolate the underlying cause. anopsiaother namesanopiascheme showing central connections of the optic nerves and optic tracts. (lesions at different locations relate to different types of anopsias.)specialtyneurology types of partial anopsia: hemianopsia homonymous hemianopsia heteronymous hemianopsia binasal hemianopsia bitemporal hemianopsia superior hemianopia inferior hemianopia quadrantanopia