Recent research shows that blue-eyed men prefer blue-eyed women. Thus it appears that, at least to some observers, eye color is important.
But why do humans have different eye colors?
It mostly comes down to the amount and location of melanin (the same substance which controls skin color) in the human eye. Pale eyes such as blue, grey or green eyes contain little melanin, dark brown eyes contain more. Which eye color you get is primarily determined by the eye color of your parents.

Did you know that your eye color influences how we see?
It turns out that it does. The darker the eyes, the more light is absorbed as light waves pass through the eye, and the less light is available to reflect within the eye. Light reflection (scatter) within the eye can cause susceptibility to glare (eg. sun or headlights) and to poor contrast discernment. Thus it seems that people with darker eyes may have better vision in high-glare situations – perhaps this makes them better night drivers, for example.

Eye color may also affect your color vision. The lighter eyes may have some advantages. It appears that blue-eyed people should really go for dark-eyed partners – this way one can pick the paint colours, and the other can drive home at night!!!