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To close and open the eyelids rapidly; an involuntary act by which the tears are spread over the conjunctiva, keeping it moist.
To close and open the eyes rapidly; an involuntary act by which the tears are spread over the cornea and conjunctiva, keeping it moist.
A temporary closure of the eyelids (usually of both eyes). Blinks are usually involuntary but may be voluntary. The frequency of blinking is conditioned by a number of external and internal factors, e.g. glare, wind, emotion, attention, tiredness, etc. Normal blink rate is about 10 blinks per minute, although there are wide variations. The duration of a full blink is approximately 0.3-0.4 s. Blink rates are often altered with contact lens wear and in some diseased states (e.g. chalazion, Graves' disease). See corneal reflex; wink.