February 1987
Volume 28, Issue 2
Free
Articles  |   February 1987
Blink-related eye movements.
Author Affiliations
  • L A Riggs
    Hunter Laboratory of Psychology, Brown University, Providence, Rhode Island 02912, USA.
  • J P Kelly
    Hunter Laboratory of Psychology, Brown University, Providence, Rhode Island 02912, USA.
  • K A Manning
    Hunter Laboratory of Psychology, Brown University, Providence, Rhode Island 02912, USA.
  • R K Moore
    Hunter Laboratory of Psychology, Brown University, Providence, Rhode Island 02912, USA.
Investigative Ophthalmology & Visual Science February 1987, Vol.28, 334-342. doi:
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      L A Riggs, J P Kelly, K A Manning, R K Moore; Blink-related eye movements.. Invest. Ophthalmol. Vis. Sci. 1987;28(2):334-342.

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Abstract

Eye movements that accompany a blink have been measured in human subjects by the use of a visual-persistence method. With straight-ahead binocular viewing, each eye typically rotates nasalward and downward 1-2 deg during the closing phase of a blink. These eye movements are more rapid than the lid movements as recorded by high-speed photography. In fact, the eyes have already completed their initial rotation and started back again before the lids are fully closed. With off-center viewing, a blink causes each eye to rotate toward its primary position of regard. Indeed, if the eye is already in that position when the blink starts, the eye moves very little. With eyelids taped open, an eye tracker can be used, and records confirming the visual persistence tracings are obtained. Sequential photography of the cornea in profile reveals that the eye moves inward and back out again during a blink. The amplitude of this retraction is typically less than 1 mm; and its time course, slower than that of the rotational eye movements, parallels the closure and opening of the lids. In normal conditions of viewing there is no evidence of conjugate saccades, or of any large, upward rotation of the eyes (Bell's phenomenon) that was once believed to take place during a blink.

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