显微镜下对５４例６２只手术眼进行活体角巩膜缘宽度测量，以结膜返折线为前界，角巩膜缘与不透明巩膜的交界线为后界，测得成人眼１２点钟位角巩膜缘宽度为１．３６ｍｍ（０．９２～１．８２ｍｍ）。同时对１６只眼的小梁切除标本行组织学观察发现，９眼见Ｓｃｈｗａｌｂｅ线和小梁结构，３眼见Ｓｃｈｗａｌｂｅ线和前部小梁，１眼见Ｓｃｈｗａｌｂｅ线，１眼见少许睫状肌，２眼未见房角结构。提示：小梁切除术选择以角巩膜缘后界之前、后各０．５ｍｍ处垂直于眼球壁的切口较为合理。 Under the microscope, 54 eyes of 62 eyes were observed for measuring the scleral limbal width. The conjunctival fold line was taken as the front and the boundary between the limbus and the ophthalmic sclera was posterior. The width of the scleral limbus at 12 o’clock was measured Is 1.36 mm (0.92 to 1.82 mm). At the same time, 16 eyes of trabeculectomy specimens were histologically observed, 9 see the Schwalbe line and trabecular structures, 3 see the Schwalbe line and anterior trabeculae, 1 see the Schwalbe line, 1 see a little ciliary muscle, 2 eyes did not See the angle structure. Tip: trabeculectomy to select the angle of the scleral margin before and after 0.5mm perpendicular to the wall of the eye wall incision is more reasonable.