The human eye blinks an average of 4,200,000 times a year
– The world's most common eye color is brown.
– Humans can see more shades of green than any other color.
Irises are classified as being one of
six colors
: amber, blue, brown, gray, green, hazel, or red.
– Blue eyed people are more tolerant of alcohol, but less tolerant of the sun.
the rarest of the main eye colors is
green
. About 2% of people worldwide have green eyes.