One of the most common viral eye infections is viral conjunctivitis, often referred to as "pink eye." Viral infections typically cause watery discharge rather than thick mucus. The affected eye may appear red, feel itchy or gritty, and produce excessive tears. Viral eye infections often develop alongside symptoms of a cold, flu, or upper respiratory infection. In many cases, the infection starts in one eye and spreads to the other within a few days. Swollen lymph nodes near the ears may also occur, particularly with certain viral infections.

Bacterial eye infections, on the other hand, are more likely to produce a thick yellow, white, or green discharge. This discharge can accumulate during sleep and cause the eyelids to stick together when a person wakes up. Bacterial conjunctivitis may affect one or both eyes and often causes redness, irritation, and mild swelling. Unlike viral infections, bacterial infections are less commonly associated with cold-like symptoms. Certain bacteria can also lead to more severe eye infections that require prompt medical attention to prevent complications.

While discharge characteristics can provide clues, it is not always possible to accurately determine the cause based on symptoms alone. Allergies, dry eye syndrome, and other eye conditions can sometimes mimic an infection. If symptoms are severe, persist for several days, or include significant pain, light sensitivity, blurred vision, or worsening redness, a healthcare professional should evaluate the condition. An eye doctor may diagnose the infection based on an examination and, in some cases, laboratory testing of eye secretions.

Proper diagnosis is important because viral and bacterial infections are managed differently. Most viral eye infections improve on their own with supportive care such as artificial tears, cold compresses, and good hygiene practices. Bacterial infections may require antibiotic eye drops or ointments prescribed by a healthcare provider. Regardless of the cause, avoiding eye rubbing, washing hands frequently, and not sharing towels or cosmetics can help prevent the spread of infection. Seeking medical advice when symptoms are concerning ensures timely treatment and helps protect long-term eye health.