Why do our eyes blink?
Blinking helps our fragile eyes to stay wet, moist and clean, by brushing away things like dust and dirt.
Even though we probably don’t think about it very much, blinking is something our body is constantly doing! In fact, it’s estimated that most people blink between 10 and 15 times every single minute!! The reason is to keep our eyes feeling good.
Blinking, as opposed to batting, supplies moisture in our eyes, which keeps them from drying out. It also keeps the foreign matter from entering and irritating our eyes. Eyelids are our built-in ‘wind-shield wipers’, that are merely folds of skin, controlled by muscles which are capable of expanding and contracting so rapidly, that blinking does not impair our vision. The rims of our eyelids are lined with 20-30 sebaceous, oil-producing glands, which are located between our eyelashes, and are invisible to the naked eye. Blinking automatically coats the eyelid and eyelashes with the lubricant it secretes, to prevent them from drying out.
Blinking is a reflex. Research says that the human brain has a talent for ignoring momentary blackout. The very act of blinking suppresses activity in several areas of the brain which is responsible for detecting environmental changes, so that you experience the world as continuous.
Some animals like the snake for example, do not have eyelids and hence cannot blink. But there is a hard film or scale over the eyes to protect them from dust and injury.