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PURPOSE The authors analyzed eyelid kinematics in normal aging subjects to test the hypothesis that eyelid movements exhibit age-related changes and that blink disorders prevalent among the elderly, in turn, represent an outcome of normal aging processes. METHODS The electromagnetic search coil technique was used to study blinks in normal human subjects(More)
A macaque monkey with a preexisting facial nerve injury showed a synkinesis of perioral muscles with blinking and thus provided a serendipitous model for a multiphasic analysis of this common neurologic syndrome. The amplitude of the paretic eyelid in spontaneous and air-puff-induced blinks was about one-third that of the normal eyelid. Despite the blink(More)
PURPOSE To provide a quantitative description of the conjugacy of human eyelid movements during spontaneous blinks. METHODS Eyelid movements occurring during spontaneous blinks were recorded bilaterally using a modification of the electromagnetic search coil technique. In off-line analyses, covariation of amplitude, peak velocity, and duration of blink(More)
Blink movement metrics were studied in three alert cynomolgus monkeys using electromagnetic search coils attached to the eyelids bilaterally. Monkey blinks averaged approximately 24 degrees. Down-phase peak velocities were approximately twice those of the corresponding up phases. Most blinks were symmetrical with close temporal linkage of onset and offset(More)
We assessed eyelid function by subjective clinical examination and quantitative means in patients recovering from facial nerve palsy. Electromagnetic search coil techniques were used to record the concurrent movements of the two eyelids to study alterations in blink main sequence (peak velocity versus amplitude) relationships and interocular differences in(More)
The alterations induced in eyelid movement metrics subsequent to unilateral injections of botulinum toxin type A into the orbicularis oculi muscle were studied in chronic alert monkeys using the search coil technique. Botulinum toxin caused rapid paralysis of blinks in the treated eyelid. The amplitude and peak velocity of blinks generated by this eyelid(More)
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