Definition of Parinaud syndrome:

Parinaud syndrome is an eye problem similar to conjunctivitis ("pink eye"). It usually affects only one eye and is accompanied by nearby swollen lymph nodes and an illness with a fever.

Causes, incidence, and risk factors:

Parinaud syndrome is caused by an infection by bacteria, virus, fungus, or parasite.

The most common causes are tularemia (rabbit fever) and cat-scratch fever. Tularemia can infect the eye either by direct entry of the bacteria into the eye (on a finger or other object), or by air droplets that carry the bacteria, and then land on the eye.

Other infectious diseases may spread this same way, or through the bloodstream to the eye.