Characteristics of strabismus in children: 1. Difficulties in cooperation of children are manifested by the lack of cooperation of many children in strabismus examination by doctors, which makes it difficult for doctors to measure the strabismus angle of children with strabismus. Accurate strabismus angle measurement for children with strabismus is the most important part of the clinical assessment of strabismus patients before surgery. As many children strabismus surgery patients cannot cooperate with the surgery under local anesthesia, the surgery must be performed under general anesthesia, so the surgeon cannot adjust the eye position while operating, as in adult strabismus surgery, or lie down and do it again if it is not possible. 3. The purpose of strabismus treatment for children is functional recovery, and only when the eye position is completely normalized in early childhood surgery, there is a chance for children with strabismus to achieve functional recovery after surgery. Therefore, if children with strabismus are not treated in time, there is a possibility that the best time for surgery will be lost. Likewise, if the child’s eye position is not normalized after surgery, even if the surgery is performed early, the purpose of the surgery is still not achieved. Therefore, a prerequisite for successful strabismus surgery in children is that an accurate clinical evaluation must be obtained and an accurate strabismus angle must be obtained prior to surgery before early surgical treatment can be performed. It is very dangerous to operate hastily without obtaining an accurate strabismus angle. There are several reasons for this: 1. The measurement of strabismus angle before surgery is one of the most important bases for surgical design, and without accurate strabismus measurement results, the success of surgery loses its foundation. 2, As mentioned above, most of the children strabismus patients in surgery are under general anesthesia and cannot cooperate with the surgeon for eye position adjustment, so that the surgeon has no chance to correct the poor results brought by inaccurate surgical design. 3. For young strabismus patients, the eye position cannot be adjusted during surgery and the post-surgical eye position adjustment is equally difficult to implement. Because the surgery is still performed under general anesthesia, such children with strabismus are also unable to cooperate with the surgeon for intraoperative eye position adjustment. 4. For patients who cannot cooperate with the surgeon for strabismus examination before surgery, it will be more difficult to cooperate with strabismus examination after surgery.