The standardized values of SC for children’s vision screening vary depending on the age of the child. Children’s vision screening SC, where S stands for spherical lens power, that is, the degree of myopia or hyperopia, S is negative for myopia, S is positive for hyperopia; C stands for cylindrical lens power, that is, the degree of astigmatism. Children are born with a certain amount of hyperopia, which means that early screening S scopes are generally positive, with an S value of about +3.00 in infancy and early childhood, then gradually decreasing to about +2.50 at about 4 years of age, +2.00 at 6 years of age, and +0.50 or 0 at about 10 years of age, all of which are considered to be normal spherical scopes. For C-column lens astigmatism, below 0.50 is within the normal range, with larger C values indicating more severe astigmatism. Whether the SC value of children’s vision is normal or not is also based on the genetic condition, children’s development, and usual eye habits, etc. The standards mentioned above are for reference only, and it is recommended to consult a professional doctor in a regular hospital.