This is what you don’t know about your eyes


Eyes began to develop 550 million years ago. The simplest eyes were patches of photo-receptor protein in single-celled animals.

Our eyes weigh just under 28.34 grams.

80% of what we learn is through our eyes.

80% of our memories are determined by what we see.

A fingerprint has 40 unique characteristics, but an iris has 256, the more reason why retina scans are increasingly being used for security purposes.

Your eyes cannot be transplanted. More than 1 million nerve fibres connect each eye to the brain and currently we’re not able to reconstruct those connections.

Corneas are the only tissues that don’t have blood.

Your eye is composed of more than two million working parts.

Your eyeballs stay the same size from birth to death, while your nose and ears continue to grow.

To protect your eyes, they are positioned in an eye socket. Eyebrows prevent sweat dripping into your eyes and eyelashes keep dirt out of your eyes.

People who are blind can see their dreams if they weren’t born blind.

There are about 39 million blind people around the world.

The entire length of all the eyelashes shed by a human in their life is over 98 feet, with each eyelash having a lifespan of about five months.

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