What is a pink eye versus uveitis in the eye?

Outside vs inside: Pink eye is irritation of the conjunctiva and the sclera, or the mucous membrane inside the lids and the surface of the eyeball. Uveitis is irritation of the end-point of the nerve as it enters the eyeball in the back. Both can cause blurred vision, but pink eye is generally infectious, while uveitis is caused by autoimmune issues in a number of conditions.

Both Pink: The pink discoloration of the conjunctiva and sclera results from inflammation in both conjunctivitis(pink eye) and uveitis. The cause of the inflammation is bacterial, or viral in conjunctivitis and has many possible causes in uveitis.

See doc: Uveitis tends to be in the eye whereas, pink eye is on the surface of the eye.

Infection?: Pink eye is an infection, usually viral. It can be extremely contagious. Often, pink eye is associated with an upper respiratory infection (cold). Uveitis has many causes. The term uveitis is often used when it is autoimmune. Both "pink eye" and uveitis can look the same to the lay person: the eye is red, injected, and there is light sensitivity.

Uveitis: Pink eye refers to conjunctivitis. Uveitis is the inflammation of the uveal tissue (iris, ciliary body, choroid). Uveitis can be infectious or non-infectious.

Totally different: Pink eye is the popular term for conjunctivitis which in adults is usually caused by a virus infecting the liniing of the eye similar to a cold infecting the lining of the throat. Most are self limited and need little care. Uveitis is a sterile inflammation of the inside of the eye causing pain, light sensitivity and a risk of internal eye damage. Treatment is with steroids; see an ophthalmolog