What are the common keratoconjunctivitis?

　　The cornea is located in the outermost layer of the eye and is most susceptible to trauma that can cloud the cornea or even cause blindness. Among corneal lesions, keratitis has a high incidence and if not treated timely or correctly can cause blindness and may require corneal transplantation. Beijing Boai ophthalmologist introduced, once the fear of light and tears, can not see when the timely treatment to prevent the occurrence of lesions. So, what are the common keratoconus?　　1, superficial punctate keratitis: for the most surface layer of the cornea epithelial cell degeneration, detachment and inflammatory cell infiltration caused. Most patients with superficial punctate keratitis have mild symptoms that they can feel themselves, sometimes with mild intraocular foreign body sensation, photophobia and tearing. The white conjunctiva next to the cornea is not red, and the corneal surface appears dotted with gray-white clouding; 2. Herpes simplex virus keratitis: This is a very common keratoconus lesion that is extremely harmful due to its recurrent recurrence, leading to severe visual impairment, the first blinding disease of keratoconus. Patients usually have strong photophobia and tearing, intraocular foreign body sensation, eye pain with side headache and vision loss; 3, fungal keratitis: due to the widespread use of antibiotics and glucocorticoids the incidence of this fungal-induced infectious keratopathy has increased significantly and has become a highly blinding infectious eye disease. Patients have the main conscious symptoms of keratitis, but the onset is relatively slow and the course of the disease often lasts several months. When medications cannot be controlled and the diseased cornea is at risk of perforation, treatment with conjunctival flap masking or corneal transplantation can be considered; 4. Bacterial corneal ulcer: A very serious form of purulent keratitis, often due to bacterial infection after corneal trauma, contact lens scratches or removal of corneal foreign bodies. Patients’ symptoms are mainly severe eye pain with radiating hemianopsia, as well as tearing, photophobia, and a foreign body sensation in the eye. These corneal ulcers are often located in or near the center of the cornea, affecting the entry of light into the eye and therefore often severely affecting vision.