| hemianopia | Loss of vision for one half of the visual field of one or both eyes. Synonym: hemianopsia. (05 Mar 2000) |
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| heteronymous hemianopia | Attitudinal hemianopia involving the upper field of one eye and the lower field of the other; or a binasal or bitemporal hemianopia. Synonym: crossed hemianopia. (05 Mar 2000) |
| pseudo-hemianopia | A condition in which individual stimuli are seen correctly, but when the nasal visual field of one eye and the temporal visual field of the fellow eye are stimulated simultaneously, one field is blind. Synonym: visual extinction. (05 Mar 2000) |
| homonymous hemianopia | Blindness in the corresponding (right or left) field of vision of each eye. (05 Mar 2000) |
| quadrantic hemianopia | Loss of vision in a quarter section of the visual field of one or both eyes; if bilateral, it may be homonymous or heteronymous, binasal or bitemporal, or crossed, e.g., involving the upper quadrant in one eye and the lower quadrant in the other. Synonym: quadrantic hemianopia. (05 Mar 2000) |
| incomplete hemianopia | Hemianopsia involving less than half the visual field of each eye. (05 Mar 2000) |
| incongruous hemianopia | An incomplete or asymmetric homonymous hemianopsia. (05 Mar 2000) |