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Ophthalmic Physiol Opt. 2008 Jul;28(4):345-53. doi: 10.1111/j.1475-1313.2008.00577.x.

Spontaneous blinking in healthy persons: an optoelectronic study of eyelid motion.

Author information

1
Functional Anatomy Research Center (FARC), Università degli Studi, Milano, Italy. chiarella.sforza@unimi.it

Abstract

PURPOSE:

To develop a method for the non-invasive detection and quantification of eyelid movements during spontaneous blinking.

METHODS:

Spontaneous eyelid movements were monitored using an optoelectronic motion analyzer with passive markers in a younger group aged 20-30 years (13 men, 12 women) and in an older group over 50 years (10 men and nine women). Blink rate, eyelid displacement as a percentage of maximum excursion, and maximum eyelid velocity in closing and opening were calculated.

RESULTS:

Spontaneous blink rate was significantly larger in women than in men (19 vs 11 blinks per minute); older women blinked more frequently than younger women. On average, young men closed the eyes completely (or almost completely) 44% of times, whereas the eyelid closure of young and older women was more frequently between 51 and 75% of the maximum excursion. Older men rarely closed completely and showed a similar frequency of blinks with up to 25%, 50% and 75% of maximum excursion. During eyelid closure and opening, the maximum velocity reduced with age: older subjects moved their eyelids approximately 80-70% slower than younger subjects. In all subjects, closing was performed 40-47% faster than opening; women moved faster than men. Eyelid displacement was greater in young than in older subjects.

CONCLUSIONS:

The method used in this study allowed the non-invasive detection of eyelid movements during spontaneous blinking, providing a set of descriptive and kinematic data. The method could also be used to assess blink characteristics in patients with movement disorders, without invasive or time-consuming procedures.

[Indexed for MEDLINE]

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