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(五)角膜炎角膜炎为常见眼病,严重时可导致失明。角膜是眼球外层膜的一部分,位于眼球最前面,经常暴露于外界,易为风沙、烟尘、异物等侵犯。角膜有其独特的生理功能,是眼球主要的屈光面,对视力起重要作用。角膜特点 (1)角膜的透明度:角膜没有血管,含水量也很恒定,角膜实质层(第三层)占角膜全厚的90％,是由许多平行、紧密、整齐、极有规则,并有同等屈光指数的纤维薄板所构成。正常情况下是无色透明的。(2)角膜的光滑度:其表面光滑
(E) Keratitis Keratitis is a common eye disease, severe cases can lead to blindness. Cornea is part of the outer membrane of the eye, located in the forefront of the eye, often exposed to the outside world, easy to sand, smoke, foreign body and other violations. Cornea has its unique physiological function, is the main refractive eye surface, plays an important role in visual acuity. Corneal characteristics (1) the transparency of the cornea: no corneal blood vessels, water content is very constant, corneal parenchyma (third layer) accounted for 90% of the total cornea by many parallel, close, neat, very rules, and Equivalent refractive index of the fiber sheet formed. Under normal circumstances is colorless and transparent. (2) Corneal smoothness: its surface is smooth