Some parents who consult their ophthalmologist about the effect of nystagmus surgery on vision improvement often get an inaccurate answer and are therefore somewhat confused as to 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 from the national and international literature, it appears that patients who are better off after surgery generally have 1 to 3 lines of vision improvement after surgery than before surgery! Because there are various underlying eye diseases in children with nystagmus, the degree of vision of patients before surgery is different, and therefore the degree of improvement in vision after surgery is also different. The goal of nystagmus surgery is not simply to improve visual acuity, but to have a child with a better quality of vision than before surgery. From a professional point of view, the human eye sees with the most precise structure, the macula. This is also known as the “time window of gaze”. The purpose of our surgery is twofold: first, to weaken the proprioceptors of the child’s muscles in the hope of reducing nystagmus through this action. Second, on the other hand, we widened the “gaze time window”, which simply means that we increased the gaze time of the central macular recess. Before the surgery, the child was not interested in distant things, but after the surgery, the child began to be interested in distant things. 2, the original child watched TV very close, but after the surgery, the child watched TV from a distance. 3, part of the child was particularly introverted and withdrawn, but after the surgery, the child’s personality became lively, and parents and children “get along”. 4.The children used to read books almost in front of their eyes, but after the surgery, they can read books at a far distance. 5.Some children’s heads were very tilted when they looked at an object carefully, but after the surgery, their heads were not very tilted anymore. These are the effects of nystagmus surgery, so Dr. Yu Gang suggests four important aspects to evaluate the effect of surgery on children: 1) whether the tilted head is improved 2) whether the book is farther away 3) whether the TV is farther away 4) whether the personality is more lively