Convergence insufficiency Health Dictionary

Convergence Insufficiency: From 1 Different Sources


a condition in which the eyes fail to turn inwards enough to achieve fusion of separate images during near vision. In some cases, convergence exercises (see orthoptics) can improve the condition.
Health Source: Oxford | Concise Colour Medical Dictionary
Author: Jonathan Law, Elizabeth Martin

Convergence

(1) Inward turning of the eyes to focus on a near point, with the result that a single image is registered by both retinas.

(2) The coming together of various nerve ?bres to form a nerve tract that provides a single pathway from di?erent parts of the brain.... convergence

Vertebrobasilar Insufficiency

Intermittent episodes of dizziness, double vision, weakness, and difficulty in speaking caused by reduced blood flow to parts of the brain. It is usually due to atherosclerosis of the basilar and vertebral arteries and other arteries in the base of the brain. Vertebrobasilar insufficiency sometimes precedes a stroke.... vertebrobasilar insufficiency

Accommodative Insufficiency

a weakness of accommodation as a part of the ageing process or as a result of injury, disease, or the effect of medication.... accommodative insufficiency

Insufficiency

n. inability of an organ or part, such as the heart or kidney, to carry out its normal function.... insufficiency

Uteroplacental Insufficiency

the most common cause of *intrauterine growth restriction, due to abnormalities in placental development and *trophoblast invasion. The exact cause may be unknown or due to a number of recognizable causes, e.g. pre-eclampsia, inherited *thrombophilias causing placental infarction or thrombosis, and systemic lupus erythematosus. It may lead to stillbirth.... uteroplacental insufficiency



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