Abnormal' Ocular Movement

Control of ocular movement.

The ocular-motor system is organized to concentrate the images received by the eye upon the fovea, the most sensitive area of the retina. The acquisition and maintenance of object images upon the fovea, together with their stabilization during head movements, constitute the basic roles of human eye movement. These movements are simply motor outputs in response to sensory (primarily visual) inpu...

Cybernetics of ocular movement.

CYBERNETICS has been defined as "the control of machines by machines instead of by men" (Stanley-Jones, 1957). Its meaning embraces also the pattern of that control. A cardinal notion is the concept of feed-back. This may be simply explained by reference to the most familiar example of cybernetic control, the thermostat of an electric iron. An electric iron is a machine for converting electrici...

Photo quiz. Abnormal ocular findings.

Normal and Abnormal Human Vestibular Ocular Function

Abnormal ocular motor control in Huntington's disease.

We studied eye movements in 50 patients with Huntington's disease. Fixation was impaired in 73% of patients; such individuals had difficulty in suppressing saccades toward novel visual stimuli. Impaired initiation of saccades was manifest by increased reaction time (89%) and inability to make a saccade without head movement (89%) or blink (35%). Saccades and quick phases of nystagmus were slowe...