# All Words Glossary

Glossary of Ophthalmic Terms
beginning with letter D
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 dioptometer
noun
1. An instrument used to measure ocular refraction, in order to prescribe corrective lenses

 diplopia
noun
1. (pathology) An ophthalmology , ophthalmologic condition where one perceives two images; double vision.

 divergence
noun (wikipedia, divergence, divergence (operator))
1. The degree to which two or more things diverge.
2. (mathematics) the operator which maps a function F=(F1, ... Fn) from a n-dimensional vector space to itself to the number $\sum_{i=1}^n \frac{\partial F_i}{\partial x_i}$

 double vision
noun
1. a disorder of vision, (diplopia), in which a single object is seen as two

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