Which of the following symptoms is characteristic of orbital cellulitis?

Acute swelling of the conjunctiva and eyelids is indeed a characteristic symptom of orbital cellulitis. This condition typically arises from an infection that affects the tissues surrounding the eye, leading to pronounced inflammation and swelling. The involvement of the conjunctiva and eyelids in orbital cellulitis is a result of the spread of infection, often from adjacent sinuses or other infections.

The characteristic swelling can also lead to redness of the eyelids and conjunctiva, making it a key clinical indicator for healthcare professionals when assessing for orbital cellulitis. While other symptoms may be present in cases of orbital cellulitis, such as those related to vision or light sensitivity, the acute swelling is notably prominent and serves as a primary sign that clinicians will observe during the physical examination of a patient suspected to have this condition.