Surgery is usually uncomplicated if a 9 year old child has a horizontal strabismus and more complicated if the child has a vertical strabismus. Depending on the type of strabismus, the complexity of strabismus surgery for a 9 year old depends on the type of strabismus. If the 9 year old has a horizontal strabismus, the surgery will require an adjustment of the rectus externus or rectus internus muscles, and the procedure is usually uncomplicated. If a 9-year-old child has a vertical strabismus, the surgery may require the upper or lower oblique muscles to be moved, which is a more complicated procedure. It is recommended that parents take their 9 year olds with strabismus to a doctor who will determine the complexity of the surgery based on the type of strabismus and the surgical procedure. In addition, patients should keep their eyes clean and dry after surgery and avoid touching water.