Why Do Humans And Animals Blink?


Blinking is an involuntary and automatic reflex of the eyelids that occurs several times a minute. We hardly even think about it, but it plays a critical role in protecting our eyes and keeping them moist and healthy. In this blog, we’ll explore the reasons why we blink and why it’s so important.

First and foremost, blinking keeps our eyes lubricated. When we blink, our eyelids spread tears over the surface of the eye, which helps to keep it moist and prevent dryness. Tears are made up of three layers: an oily outer layer, a watery middle layer, and a mucus-like inner layer. Each layer has a specific function, but together they work to lubricate the eye and protect it from infections.

Blinking also helps to clear away any debris or dust that may have settled on the surface of the eye. As we go about our day, our eyes are exposed to a variety of particles, including dirt, pollen, and other environmental irritants. Blinking helps to remove these particles and keep our eyes clean and healthy.

Another important function of blinking is to protect the eye from injury. Our eyelids act as a barrier, shielding the eye from potential hazards like bright lights, strong winds, and flying objects. If something does come too close to the eye, our natural reflex is to blink, which helps to close the eyelids and prevent the object from making contact with the eye.

In addition to these physical functions, blinking also plays a role in communication and social interaction. Studies have shown that we blink more frequently when we’re engaged in conversation with someone, especially if we’re listening to them speak. Blinking can signal to the other person that we’re actively listening and paying attention.

So, why do we blink so frequently? The average person blinks about 15 to 20 times per minute, which adds up to around 1,200 blinks per hour and 28,800 blinks per day. This may seem like a lot, but it’s actually necessary to keep our eyes healthy and functioning properly.

One reason why we blink so frequently is that the cornea, the clear outer layer of the eye, is particularly sensitive to dryness and irritation. Blinking helps to keep the cornea moist and prevent irritation, which could lead to more serious problems if left untreated.

Another reason why we blink so often is that our eyes are constantly adapting to changes in our environment. Whether we’re looking at a computer screen, reading a book, or driving a car, our eyes are constantly adjusting to changes in lighting and focus. Blinking helps to re-moisten and re-focus the eye, allowing us to see more clearly and comfortably.

Interestingly, some studies have suggested that we may blink more frequently when we’re experiencing negative emotions, like stress or anxiety. This could be a subconscious attempt to protect the eyes from potential threats, or it could be a way of regulating our emotional state. Regardless of the reason, it’s clear that blinking plays an important role in our physical and emotional well-being.

In conclusion, blinking is a critical function of the eye that serves several important purposes. It keeps the eye lubricated, clears away debris, protects the eye from injury, and even plays a role in social communication. While we may not think about it much, we rely on blinking thousands of times a day to keep our eyes healthy and functioning properly. So, the next time you catch yourself blinking, take a moment to appreciate this incredible and often overlooked reflex.