What Is Gaze Testing?
A component of the neurological and ophthalmic examination used to evaluate the function of the oculomotor system, assessing the speed, accuracy, and stability of eye movements.
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Key Assessments
Includes testing saccades (fast jumps), smooth pursuit (tracking slow objects), and gaze holding (maintaining fixation in lateral and vertical positions).
Clinical Significance
Abnormalities, such as nystagmus (involuntary eye movements) or slow saccades, can localize lesions in the brainstem, cerebellum, or specific cranial nerves (III, IV, VI).
Methods
Can be performed manually using the examiner's finger or specialized video-oculography (VOG) equipment for precise measurement.
What is a 'saccadic overshoot'?
An error in a saccade where the eye jumps too far past the target and must quickly execute a small corrective movement back to the target.
What nerve controls lateral gaze?
The Abducens nerve (Cranial Nerve VI) is primarily responsible for moving the eye outward (abduction) and is crucial for lateral gaze testing.
What is the H-pattern in gaze testing?
The H-pattern is the standard sequence of eye positions used to test all extraocular muscles and nerves: Center, Left, Up-Left, Down-Left, Right, Up-Right, Down-Right.