He's not wearing contact lenses!

How does a gene, a section of a chromosome in the cell nucleus, make the eyes a particular color?

The exact color of the human eye is determined by the amount of a single pigment called melanin that is present in the iris of the eye. Melanin is a dark brown pigment that is deposited on the front surface of the iris. If a lot of melanin is present, the eye will appear brown or even black. If very little melanin is present the iris appears blue. Intermediate amounts of melanin produces gray, green, hazel or varying shades of brown. Genes work by directing the production of enzymes, chemicals that control all of the processes that occur in our body. Eye color genes, through the enzymes they produce, direct the amount and placement of melanin in the iris. In general Caucasian babies are born with blue eyes because at the time of birth they haven't begun to produce melanin in their irises. Their eyes may change to green, brown or other colors as melanin production begins. Babies of other ethnic origins such as African, Asian, Hispanic and Native American, are often born with brown or black eyes.

From "The Genetics of Human Eye Color" -Oregon State University
More here.

Someone really did ask me if Fabian was wearing contact lenses! I thought he was joking, but apparently he was serious and really wanted to know. Funny!