眼科的一些临床操作常常需要在裂隙灯下完成，如白内障、人工晶状体植入术后拆线，角膜异物剔除，角膜锈环剔除等等。由于在裂隙灯显微镜下操作，患者取坐位，开睑器置入睑裂后受重力影响，脸裂外的开睑器一端常常下坠，操作中突然脱落或者开睑器移位使患者眼睑疼痛、眼睑痉挛 Some clinical operations in ophthalmology often need to be done under slit lamps, such as cataract, suture removal after intraocular lens implantation, corneal foreign body removal, corneal rust ring elimination and so on. Due to the operation under the slit lamp microscope, the patient takes the sitting position, the eyelid opening device is placed under the influence of gravity after the eyelid rupture, one end of the eyelid opening device outside the face cracking often falls, the operation suddenly drops off or the eyelid opening device displaces the patient’s eyelid, Blepharospasm