Enyedi proposed what is popularly known as “the rule of 7,” where the sum of postoperative refractive goal and age of the child is 7, and target refraction is decided accordingly: +6 for a 1-year-old, +5 for a 2-year-old, +4 for a 3-year-old, +3 for a 4-year-old, +2 for a 5-year-old, +1 for a 6-year-old, plano for a 7- ...