Parents of children with nystagmus often get inaccurate answers when they ask their ophthalmologist about the effectiveness of post-operative vision improvement, so they wonder why surgery is necessary if nystagmus surgery does not improve vision significantly. Nystagmus specialists in the United States have been studying nystagmus surgery for decades and the literature concludes that because children with nystagmus have a variety of underlying eye diseases, the degree of vision of the patient before surgery is different and therefore the degree of improvement in vision after surgery is also different. Patients who are generally better off after surgery have 1 to 3 lines of improved vision compared to pre-surgery! Therefore, parents should be clear: the purpose of nystagmus surgery is not simply to improve visual acuity, but to reduce nystagmus, which is also known as the “gaze time window” from a professional perspective, in the hope that the child will have a better quality of vision than before surgery. The purpose of the procedure is twofold: first, to weaken the proprioceptors of the child’s muscles in the hope that the nystagmus will be reduced by this action. Second, the other is to widen the “gaze time window”, which simply means that the time spent gazing at the central macular sulcus is increased, and although the vision of some children after surgery does not improve significantly, the quality of the child’s gaze is improved. Some parents of children who have undergone the surgery are happy to tell us the changes in their children: 1. When they looked at an object carefully, their heads were very crooked, but after the surgery, their heads are not very crooked! 2. Before the surgery, the child looked at the TV very close and was not interested in distant things, but after the surgery, the child looked at the TV far away and was interested in distant things! 3, before the children read books almost lying to the book to read, after the surgery to read the book far away. 4, before walking and climbing stairs easily fall, holding things unstable and inaccurate, but now the coordination ability is much better! 5. Some of the children were particularly introverted and withdrawn, but after the surgery, their personalities have become lively and cooperative! Therefore, Director Yu Gang, head of the Nystagmus Treatment Group at Beijing Children’s Hospital, solemnly reminds parents that they should not focus only on the visual acuity to assess the post-operative effect of their children, but suggest to refer to the above indicators, as these changes are the surprises brought by the surgery. Moreover, there are many follow-up treatments after surgery, such as brain visual perceptual training, binocular stereopsis deactivation training, etc. Therefore, the surgery should be performed as early as possible, in an effort to win more valuable training time for the child and to fully prepare the baby for a higher level of visual quality.