at what age does myopia set in
Using the same method, in 1999–2004, myopia prevalence was estimated to have climbed to 41.6%. A study of 2,523 children in grades 1 to 8 (age, 5–17 years) found nearly one in 10 (9.2%) have at least − 0.75 diopters of myopia.
1 High myopia (greater than 5 or 6 diopters of nearsightedness) increases the risk of a retinal detachment. 2  In fact, the risk increases to 2.4% as compared to a 0.06% risk for a normal eye at 60 years of age.