正常角膜的基质层是由镶嵌在特殊胶质中的胶原纤维所组成。这些胶原纤维的直径几乎是完全相等的。其排列显示出高度的方向性并且形成带状束,然此类带状束内的长轴不仅相互平行而且与其表面也平行。带状束的横剖面显示纤维的直径是在20～30mμ之间。分布曲线的极为陡直提示纤维直径仅有轻微的变化。尽管纤维具有高度的方向性,但没有完整的晶格状形式。在横剖面上,可以依照Weibel的数 The normal corneal stroma is composed of collagen fibers embedded in a special gum. The diameter of these collagen fibers is almost exactly equal. Their arrangement shows a high degree of directivity and forms a ribbon beam, though the major axes in such ribbon beams are not only parallel to each other but also parallel to their surface. The cross section of the ribbon beam shows that the diameter of the fibers is between 20 and 30 mμ. The extremely steep profile shows that there is only a slight change in fiber diameter. Despite the high degree of fiber orientation, there is no complete lattice-like form. In cross-section, we can follow the number of Weibel