Refractive surgery can be done in anyone older than 18 years of age. The reason for this age limit is that the eye continues to change in shape and size at least until 18 years of age. Some people even have continued changes in eyes beyond 18 years of age, which can increase prescription power of glasses. Therefore, another criteria for refractive surgery correlating to age is that the prescription power of glasses should have been stable for at least two years. There is no age limit for people older than 18 years, but factors such as comorbid conditions may limit a person from getting refractive surgery.