Keratitis often results in different recovery times due to different causative factors, different etiologies, and different severity of the patient’s condition. Usually bacterial keratitis is most commonly caused by Streptococcus pneumoniae, which causes creeping corneal ulcers, and most of them will recover in about half a month with quinolone antimicrobials, such as ofloxacin eye drops. Viral keratitis is generally more common with herpes simplex virus, often starting due to cold, fever, and exertion. The disease often recurs, and will return to normal in about half a month if it is a first episode, and in patients with recurrence, it will generally return to normal in about a month to three months. Fungal corneal ulcers generally have a long course and a poor prognosis. On the one hand, because the disease is relatively insidious and patients do not seek medical attention in a timely manner, it is easy to be diagnosed untimely, and secondly, because there is no specific drug treatment, it usually takes about three months to recover. There are also keratitis related to personal immunity, such as corneal limbal degeneration, which is treated with glucocorticoids and usually recovers in two weeks. There are also nibbling corneal ulcers, which have a higher rate of blindness and are difficult to treat, taking about six months. There is also keratoconjunctivitis, which is an antigenic antibody reaction and is also treated with hormonal medication along with antiviral therapy, but the course of the disease is long and mostly takes more than six months. In short, keratitis is a complex condition and etiology that requires timely medical attention and symptomatic treatment to make recovery time not unexpectedly prolonged.