In uveitis, white blood and inflammatory cells can enter the anterior chamber of the eye and adhere to the back surface of the cornea or enter the space between the lens and the retina in various types of uveitis. Transparency of the clear fluid that fills the space between the cornea and the lens (or between the lens and the retina) can be reduced due to the inflammation reaction of the eye. The amounts of these cells and reduced transparency that are present indicate the level of severity of inflammation.