The cornea is characterized by transparency and nerve abundance. Having keratitis the clear cornea becomes cloudy, either locally in a small area or in the whole cornea, manifesting as varying degrees of vision loss. The cornea itself is not metabolically active and heals slowly and over a long period of time due to surface lesions. The cornea is very rich in sensory nerves and once damaged the senses are very sensitive, even though a small trauma or foreign body entering the eye can cause significant pain, tearing, photophobia, inability to open the eye and other symptoms. The symptoms of keratitis of different nature will have different manifestations, the general keratitis symptoms have the following developmental process: When the cornea under certain triggers, such as rubbing the eye, sand, objects or some plant bruises, trauma, inverted eyelashes stinging eyes, improper use of contact lenses, surgery, etc., the conjunctiva praised the original or by the unclean injury to bring in pathogenic microorganisms will take advantage of the opportunity to infect the eye risk spasm, sometimes appear discharge. The cornea becomes cloudy with grayish white dots, stripes and flakes. If left untreated, the symptoms worsen and the eye becomes red and swollen, the corneal clouding expands and progresses deeper, and the surrounding cornea becomes edematous and less transparent. Gradually, the central tissue of the lesion becomes necrotic, melts, and detaches, forming an ulcer called a corneal ulcer, and in severe cases, iridocyclitis, pus accumulation in the anterior chamber, and secondary glaucoma may develop. When the ulcer continues to progress deeper, resulting in full corneal ulceration, a corneal perforation occurs and vision is sharply reduced, when the atrial fluid, iris, lens, and vitreous humor in the eye rush together to the perforated area. If the perforation is small, only the atrial water flows out and the iris can be embedded in the perforation. If the lesion stops developing after treatment, the perforation gradually heals and an adhesive corneal white spot is formed after the mouth.