Medically reviewed by Johnstone M. Kim, MD A coloboma is a missing piece of tissue in a person's eye. It is a congenital ...

The uvea is made up of a layer of blood vessels, a muscular ring that surrounds your pupil, and the iris, the colored part of your eye. Together, they help your eyes focus so you can clearly see ...

Most people have had an eye problem. Some are minor and go away on their own, or are treatable at home. Others need expert care. If your eyes are dry and itchy, there could be many causes.

Eye color is formed by the combination of different genes and is determined by the substance melanin. If the melanin content ...