blink

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blink

(blink),
To close and open the eyelids rapidly; an involuntary act by which the tears are spread over the conjunctiva, keeping it moist.
Synonym(s): wink

blink

(blingk)
To close and open the eyes rapidly; an involuntary act by which the tears are spread over the cornea and conjunctiva, keeping it moist.

blink 

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.

blink

the involuntary movement of one or both eyelids of both eyes simultaneously. The frequency varies between species. Cats blink the least, with the possible exception of owls. In birds it is the lower eyelid which is moved up to meet the upper lid. In mammals the upper eyelid is moved down to meet the lower lid. The blink is a part of several reflexes including the palpebral, conjunctival and menace reflexes.

blink reflex
see blink response.
blink response
absent in lesions of the ophthalmic branch of the trigeminal nerve. Called also blink reflex.
References in periodicals archive ?
Using brain scans during a recent study, scientists learned we blink during pauses in a conversation or when the scene changes in a movie.
Dr Tamami Nakano, of Tokyo University, said: "Our results suggest humans share a mechanism for controlling the timing of blinks that searches for the appropriate timing to prevent the loss of critical information from the flow of visual information.
They used the timing of those blinks as a reference, and then played the volunteers the same clip again and measured whether the eye blinks occurred at the same time as the reference blinks.
People tend to squint when they read a book or a computer display, and that squinting makes the blink rate go way down," points out James Sheedy, professor of optometry.
Researcher Davina Bristow said: "Suppressing the brain areas involved in visual awareness during blinks may be a neural mechanism for preventing the brain from becoming aware of the eyelid sweeping down over the pupil and the world going dark.
When not enough tears are being produced to keep the eye moist between blinks, or when the film composition is abnormal, tear film breakup can occur too quickly before our impulse to blink.
A separate bar can represent the average blinks per minute for each activity.
Take frequent breaks, and blink more to keep your eyes moist.
AccuBlink continues to generate a seamless succession of three- blink sequences until the tap count is reduced to zero or a reset (e.
LARGE parts of our brains switch off every time we blink, scientists revealed yesterday.
On satellite TV, Sky lunchtime newsreader Mark Longhurst blinks every 1.
They clocked one Japanese female TV news presenter at an incredible 176 blinks a minute.