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exophoria
exophoria n. 
/ˌɛksoʊˈfɔriə/ Medicine a tendency of the visual axes to diverge laterally from parallelism; latent divergent squint.
Brit. /ˌɛksə(ʊ)ˈfɒrɪə/
, /ˌɛksə(ʊ)ˈfɒrɪə/U.S. /ˌɛksəˈfɔriə/
, /ˌɛksəˈfɔriə//ˌɛksoʊˈfɔriə/ΚΠ
1886 G. T. Stevens in N.Y. Med. Jrnl. 4 Dec. 626/2 The different relations of the visual lines..may be defined and arranged as follows..I. Generic Terms.—Orthophoria: A tending of the visual lines in parallelism. Heterophoria: A tending of these lines in some other way. II. Specific Terms.—Heterophoria may be divided into: 1. Esophoria: A tending of the visual lines inward. 2. Exophoria: A tending of the lines outward. 3. Hyperphoria: A tending of the right or left visual line in a direction above its fellow.
1964 S. Duke-Elder Parsons' Dis. Eye (ed. 14) xxx. 472 If the latent deviation is one of convergence the condition is called esophoria, of divergence exophoria, if vertical, hyperphoria.
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