Scotoma

A fixed spot abnormality or space in in the the field of vision corresponding to some retina or optic centers of the brain. S., Absolute, a scotoma in which perception of light is entirely absent. S., Central, a scotoma limited to the region of the macula lutea, or its immediate vicinity. S., Color, color - blindne limited to a part of the visual field, and which may exist without interruption of the field for white light. S., Flittering, a scotoma with serrated margins extending peripherally and producing a large defect in the visual field. S., Negative, a defect due to the destruction of the retinal center, and which is not noticeable to the patient. S., Positive, a scotoma perceptible to the patient as a dark spot before his eyes. S., Relative, a scotoma within which perception of light is only partially impaired. S., Ring, zones of scotoma surrounding the center of ing. the visual field. S., Scintillating. See S., Flitter obtained from the olive- Scorbutic (skor-bu'-tik). Pertaining to, affected with, or of the nature of scorbutus. S. Cancer. Svnonvm for Cancrum or is.