what is wrong with kenzies eye on the show of ncis los angeles?

Daniela Ruah plays the role of Junior Agent Kensi Blye on NCIS: Los Angeles. She has a birthmark on the iris of her right eye that makes it appear black. Her left eye is naturally hazel. It has no effect on her vision.

Daniela has been playing the role of Agent Blye since 2009. The character first appeared on NCIS in the two part season 6 episode "Legend" and a 2011 episode of "Hawaii Five-0."

Saturday, March 10 2012
Source: http://www.danielaruah.net/daniela-ruah-eyes/