Question

when exposed to bright light suddenly​

Answer 1

That the eyes blink when exposed to bright light is called blink reflex which is a safety mechanism of human eyes. This mechanism usually can save our eyes from damages or foreign irritation. If you suddenly enter a bright environment or a beam of intense light directly points at you, your eyes cannot immediately adjusted to the bright light. The amount of light that enter your eyes is controlled by the pupils. Since the speed of the light to your eyes is higher than that of blinking eyes, your pupils cannot close completely thus there is too much light getting in your eyes. Compensation is made by blinking eyes to cut of the excessive light. Besides bright light, your eyes can also blink as the reaction to loud sound.

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