1) Hemianopsia 2) Hemiopia 1) Hemianopsia 2) Vision defect 3) Visual defect 4) Visual disorder 5) Visual impairment 
Loss of vision of one-half of the visual field.
(from the article `eye, human`) ...halves of the retinas will have been blocked; the same will be true if one optic tract is severed or one lateral geniculate body is destroyed. The ...
Loss of vision for one half of the visual field of one or both eyes. ... Synonym: hemianopsia. ... (05 Mar 2000) ... 
(hem″e-ә-no´pe-ә) defective vision or blindness in half of the visual field; usually applied to bilateral defects caused by a single lesion. adj., hemianop´ic, hemianop´tic., adj. homonymous hemianopia hemianopia affecting the right halves or the left halves of ...
Type: Term Pronunciation: hem′ē-ă-nō′pē-ă Definitions: 1. Loss of vision for one half of the visual field of one or both eyes. Synonyms: hemianopsia
[n] - blindness in one half of the visual field of one or both eyes
Greek hemi = half, an = negative, opsis = vision, hence loss of half of the field of vision.