To discuss endoscopic mucosal resection( EMR) to the usefulness and the safety of the elderly colonic applanation and extensive tumor treatment.
目的探讨内镜下黏膜切除术（EMR）对老年大肠扁平及广基肿瘤治疗的有效性及安全性。
2
Based the principle of total reflection, the unique cone applanation prism is designed, by which the applanation area of ocular cornea can be measured linearly.
利用全反射原理，设计了特殊的圆台压平棱镜探头，可线性测量角膜的压平面积。
3
The linear measurement principle of flattened diameter of the ocular cornea and the location deviation of the cone prism which is used in the applanation tonometer are introduced.