Sight is such a big part of everyday life that it requires about half of the brain to get involved. More fun facts: You blink about 12 times per minute. Your eyes are about 1" across and weigh about 0.25 ounce. Some people are born with two different coloured eyes. This is called heterochromia. Eyes are so amazing and complex! Keep them healthy, book an eye exam http://www.midlandoptical.ca/