Although blue eyes are considered quite rare among most dogs, you're more likely to seem them occur in these breeds.

This is because the eyes contain a wealth of information about the body's health. Retinal imaging can help to detect signs of diseases such as Alzheimer's, Parkinson's, and multiple sclerosis .

According to Healthline, 45% of Americans have brown eyes, 27% have blue eyes, 18% have hazel eyes and 9% have green eyes. That means there are tens of millions of blue-eyed people in the U.S. alone.

Blue eyes have been around for at least 7,000 years but we still don't know exactly why they evolved. Brad Pitt has them, Paul Newman had them — but when it comes to the human population as a ...

From iconic historical figures to Hollywood stars - blue eyes have always been 'in'. Yet, few will have guessed they originated in this small corner of Europe.