Objective To discuss which is good or bad of dacryocystorhinostomy with endoscope and traditional dacryocystorhinostomy.

Objective: to explore the effectiveness and nursing care of patients with endoscopic transnasal dacryocystorhinostomy in the treatment of traumatic obstruction of the nasolacrimal duct.

A detection system based on ring laser used for inner wall of deep hole is proposed. The system mainly consists of ring laser, reflecting prism, CCD camera and driving unit.