The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. The cornea, along with the anterior chamber and lens, helps to refract light to focus on the retina. Keratitis is inflammation of the cornea. Infection is the most frequent cause of keratitis. Bacteria, viruses, fungi, and parasitic organisms may all infect the cornea, causing infectious keratitis. Signs and symptoms of keratitis include eye redness, eye pain, excess, blurred vision, decreased vision, sensitivity to light (photophobia), and a feeling that something is in the eye. Infectious keratitis is a serious sight-threatening ocular infection and one of the most significant complications of contact lens usage. Damage to the cornea can occur rapidly and early diagnosis and treatment are essential. The eye examination consists of checking vision and careful inspection of the corneas using a slit lamp. The principal therapeutic goal is to eliminate the pathogens, prevent irreversible corneal structural damage, and reduce the incidence of severe visual loss. Treatment depends on the cause of the keratitis. Infectious keratitis generally requires antibacterial, antifungal, or antiviral therapy to treat the infection. This treatment can involve prescription eyedrops, pills, or even intravenous therapy. With proper diagnosis and appropriate treatment including follow-up care, keratitis can usually be managed without causing permanent visual disturbances.