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眼球前部暴露部分覆盖有一层液体薄膜即泪液薄膜。角膜是屈光间质中屈光力最大的部分,有45～47屈光度,而其屈光力均始于角膜前的泪液薄膜。当光线通过其与角膜屈度相一致的界面时,屈折率发生最大的改变,所以泪液薄膜为角膜提供了一个高质量的光学表面。而且完整的泪液层对角膜和结膜上皮的健康生存同样也是很重要的。泪液薄膜还有其他的功能,其中有些与泪液分泌系统的特性有关系。在眼睑的启闭运动中,泪液薄膜的水层起滑润剂的作用,泪液中还含有某些酶如溶菌酶及β-溶解素,均有杀菌作用。除影响氧及二氧化碳的气体交换外,泪液薄膜是否有营养上皮的作用尚有争论;此外对正常
The exposed part of the front of the eye is covered with a layer of liquid film, tear film. Cornea is the refractive power of the largest part of the refractive power, 45 to 47 diopters, and its refractive power began in the pre-corneal tear film. As light passes through its interface with the corneal flexion, the refractive index changes most, so the tear film provides the cornea with a high quality optical surface. And intact tears on the cornea and conjunctival epithelium healthy survival is also very important. Tear film has other functions, some of which are related to the characteristics of the tear secretion system. In the eyelid opening and closing movement, tear film water layer from the role of lubricant, tear also contains some enzymes such as lysozyme and β-lysine, have bactericidal effect. In addition to affecting oxygen and carbon dioxide gas exchange, the tear film is the role of vegetative epithelium is still controversial; in addition to normal