When does nearsightedness start? How does it change over time?
Nearsightedness usually begins in childhood between ages 6 and 12. During the teen years, as the eyeballs continue to grow, it may develop or get worse quickly. Teenagers may need new glasses every 12 months or even more often.
Nearsightedness usually stops getting worse by age 20. Most nearsightedness stabilizes at a mild to moderate level.