CMV stands for Cytomegalovirus. This virus is a common source of infection in humans and generally lays dormant in the body without producing symptoms. When CMV attacks the cells in the retina, the condition is called CMV Retinitis. CMV Retinitis develops in 20% to 40% of patients with AIDS, making it the most common AIDS-related infection of the eye. In the early stages of CMV, you may not notice any change in vision, or you may notice "floating" particles or loss of peripheral vision. The condition often begins in one eye and then may appear in the other. If left untreated, the disease progresses and can cause serious loss of vision. CMV Retinitis is not associated with light sensitivity, pain, or redness of the eye.