Because they're still getting worse. I'm 19 and started wearing glasses when I was around 10. I go to the eye doctor maybe once or twice a year, definitely at least once and every time I go I have to have my prescription updated to stronger lenses. Is this normal? I never thought to ask my doctor because I usually have glasses or contacts in all the time, like I have no idea how bad my eye site is. But recently I broke my glasses and feel too lazy to put in contacts and I was like woahhhh im blind.
Read more: Are glasses supposed to stop my eyesite from getting worse?