| 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) |
| scotoma | 1. An area of lost or depressed vision within the visual field, surrounded by an area of less depressed or of normal vision. 2. Mental scotoma Origin: Gr. Skotoma (18 Nov 1997) |
| 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) |
| adducted thumbs with mental reatardation | A syndrome with the following characteristic features: (1) neurologically:mental retardation and aphasia (lack of speech); (2) limbs: adducted (clasped) thumbs, absent extensor pollicis longus and/or brevis muscles to the thumb, shuffling gait, and leg spasticity; (3) growth: small body size; (4) skeleton: lumbar lordosis (sway back). The syndrome is inherited as an X-linked trait and so affects mainly boys. Alternative names include MASA syndrome ( MASA stands for mental retardation, aphasia, shuffling gait, and adducted thumbs), clasped thumb and mental retardation, congenital clasped thumb with mental retardation, and the Gareis-Mason syndrome. (12 Dec 1998) |
| mental | 1. <psychiatry> Pertaining to the mind, psychic. 2. <anatomy> Pertaining to the chin. Origin: L. Mens = mind, L. Mentum = chin (18 Nov 1997) |
| mental aberration | Disturbed thought or behaviour that connotes a psychological or psychiatric impairment. See: delusion. (05 Mar 2000) |
| mental age | A measure, expressed in years and months, of a child's measured intelligence relative to age norms as determined by testing with the Stanford-Binet intelligence scale. (05 Mar 2000) |
| mental agraphia | The inability to express ideas in writing. Synonym: mental agraphia. (05 Mar 2000) |