heterophoria
C2CEFR level
99/100Rarity: very rare
TechnicalRegister
A latent tendency of the eyes to deviate that is controlled by binocular fusion.
The cover test uncovered a heterophoria that only manifested when fusion was disrupted.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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