1、 General Functions1.cornea and sclera make up the externalwall2.important refraction substance:+43D，3/4 of the total refractive power3.no blood vesselImmune privilegeTransparent corneaEpitheliumBasal cellsBowman membraneStromaDescemet membraneEndotheliumKeratitis Etiology1.infectivity : bacteria、fun
2、gi、virus、acantha amoeba2. endogenetic:3. spread:Pathobiology causative agent infiltration transparentcorneal ulcer descemetocele corneal perforationnebulamacula corneal scar corneal fistulaleucoma Adhesiveness keratoleukomaglaucoma corneal staphylomapanophthalmitisatrophia bulbi（眼球萎缩）clinical manife
3、station Symptom: ophthalmalgia、photophobia、tearing、spasm of eyelid、secretion、sight descent Sign: ciliary congestion、corneal infiltration、corneal ulcerDiagnose Symptom + Sign laboratory examinationTherapy Remove etiological factor Control infection Promote healing Decrease cicatricleBacterial keratitis Etiologycorneal traumapathogenic bacteriapartly&systemic factors
