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5 Cards in this Set

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  • Back
We blink for __ seconds, every _-_ seconds.
for 0.3 seconds, every 2-10 seconds
How many muscles are needed to control eye movements in each eye?
6
How many times do we blink per day?
approximately 20,000 times a day
Every day blinking allows the eye to do what for approximately 30 minutes .
close
How much of the eye is open to external enviroment?
1/6