Which ocular symptom is often observed in patients with SLE?

Conjunctivitis is frequently observed in patients with systemic lupus erythematosus (SLE), which is characterized by inflammation of the conjunctiva. This inflammation can arise due to various factors related to the disease, including autoimmunity and the overall inflammatory processes that occur throughout the body. In SLE, the immune system can mistakenly attack its own tissues, leading to ocular symptoms such as conjunctivitis. This can result in redness, itching, and discomfort in the eyes.

In contrast, double vision is not a common systemic symptom directly tied to SLE, although it may occur in very specific cases related to neurological involvement. Cataracts and glaucoma are generally associated with long-term steroid use, which can be a treatment for SLE, but they are not primary ocular manifestations of the disease itself. Therefore, among the listed options, conjunctivitis stands out as the ocular symptom most directly related to SLE.