| typical achromatopsia | Achromatopsia with absent colour vision, nystagmus, reduced visual acuity, and light aversion. Synonym: rod monochromatism, typical achromatopsia. (05 Mar 2000) |
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| typical pseudocholinesterase | A cholinesterase formed in the liver and present in plasma; it catalyses the hydrolysis of succinylcholine, first into succinylmonocholine and choline, and then into choline and succinic acid. (05 Mar 2000) |
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| achromatopsia | A severe congenital deficiency in colour perception, often associated with nystagmus and reduced visual acuity. Synonym: achromatic vision, monochromasia, monochromasy, monochromatism. Origin: G. A-priv. + chroma, colour, + opsis, vision (05 Mar 2000) |
| atypical achromatopsia | Incomplete achromatopsia with normal visual acuity and no nystagmus. Compare: dyschromatopsia. (05 Mar 2000) |
| complete achromatopsia | Achromatopsia with absent colour vision, nystagmus, reduced visual acuity, and light aversion. Synonym: rod monochromatism, typical achromatopsia. (05 Mar 2000) |
| incomplete achromatopsia | Impaired, but not absent, colour vision with less severely reduced visual acuity than in complete achromatopsia; inherited as an autosomal recessive or as an X-linked disorder (blue cone monochromism; pi cone monochromatism ). (05 Mar 2000) |