Cogan's oculomotor apraxia

apraxia /aprax·ia/ (ah-prak´se-ah) loss of ability to carry out familiar purposeful movements in the absence of motor or sensory impairment, especially inability to use objects correctly.

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amnestic apraxia  loss of ability to carry out a movement on command due to inability to remember the command.

Bruns' apraxia of gait  Bruns' frontal ataxia.

Cogan's oculomotor apraxia , congenital oculomotor apraxia an absence or defect of horizontal eye movements so that the head must turn and the eyes exhibit nystagmus in attempts to see an object off to one side.

ideational apraxia  sensory a.

innervatory apraxia , motor apraxia impairment of skilled movements not explained by weakness of the affected parts, the patient appearing clumsy rather than weak.

sensory apraxia  loss of ability to use an object due to lack of perception of its purpose.

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Cogan's oculomotor apraxia

[ko′gənz]

Etymology: David Glendenning Cogan, American ophthalmologist, 1908-1993

an absence or defect of horizontal eye movements, so that when the patient tries to look at an object off to one side, the head must turn to bring the eyes into line with the object and the eyes exhibit nystagmus. The cause is probably a brain lesion. Also called Cogan's syndrome.