A patient presents with burning eyes, redness, swelling, and purulent discharge, but no change in vision, indicating which condition?

The symptoms presented—burning eyes, redness, swelling, and purulent discharge—are classic signs of bacterial conjunctivitis. In this condition, the eyes often experience inflammation and produce a thick, yellow-green discharge. The presence of purulent discharge is particularly indicative of a bacterial infection and helps differentiate it from other types of conjunctivitis.

Patients with bacterial conjunctivitis typically do not report changes in vision unless the infection is severe or leads to complications that involve the cornea. The absence of vision change in this scenario aligns with the diagnosis, reinforcing that bacteria are likely the culprits behind the irritation and discharge.

While allergic conjunctivitis and viral conjunctivitis can also cause redness and swelling, they do not typically present with purulent discharge. Allergic conjunctivitis is more associated with watery discharge and itching, while viral conjunctivitis may feature more watery discharge and can cause itching or discomfort without the thick pus characteristic of bacterial infections. Corneal ulcers are also associated with pain and potential changes in vision, which are not indicated here. Therefore, the scenario presented strongly suggests bacterial conjunctivitis as the correct condition.