| positive scotoma | A scotoma that is perceived as a black spot within the field of vision. (05 Mar 2000) |
|---|---|
| hemianopic scotoma | A scotoma involving half of the central field. (05 Mar 2000) |
| scintillating scotoma | A localised area of blindness edged by brilliantly coloured shimmering lights (teichopsia); usually a prodromal symptom of migraine. See: fortification spectrum. Synonym: flittering scotoma. (05 Mar 2000) |
| Seidel's scotoma | A form of Bjerrum's scotoma. See: Seidel's sign. (05 Mar 2000) |
| sickle scotoma | A comet-shaped scotoma, occurring in glaucoma, attached at the temporal end to the blind spot or separated from it by a narrow gap; the defect widens as it extends above and nasally curves around the fixation spot, and then extends downward to end exactly at the nasal horizontal meridian. Synonym: Bjerrum's sign, sickle scotoma. (05 Mar 2000) |
| negative scotoma | A scotoma that is not ordinarily perceived, but is detected only on examination of the visual field. (05 Mar 2000) |
| quadrantic scotoma | A scotoma involving a quarter segment of the central visual field. (05 Mar 2000) |
| zonular scotoma | A curved scotoma not corresponding to the path of retinal nerve fibres. (05 Mar 2000) |
| flittering scotoma | A localised area of blindness edged by brilliantly coloured shimmering lights (teichopsia); usually a prodromal symptom of migraine. See: fortification spectrum. Synonym: flittering scotoma. (05 Mar 2000) |