Viral vs Bacterial Pink Eye Both viruses and bacteria can cause pink eye. Conjunctivitis, uveitis, irits, elevated pressure in the eye, as well as sinusitis, can also cause pink eye. The commonest cause of pink eye is conjunctivitis. Conjunctivitis can be due to viruses, bacteria, allergies, or chemicals. Allergic conjunctivitis is an abnormal hyper-sensitive […]