In patients with uveitis or patients with special scars in the retina, we may ask if there is any history of pets.
A recent cat scratch in a patient with neuroretinitis or a young patient with a branch vein occlusion may represent cat scratch disease. These patients may even be systemically ill, with fever, neurological problems, and/or lymph node swelling.
Old ocular toxoplasmosis may be the etiology of dormant-appearing scars in the retina. An active area of retinal inflammation (retinochoroiditis) may represent active ocular toxoplasmosis. Patients may have a history of cleaning out the kitty litter box, having a sandbox that cats frequent, or eating undercooked meat.