How can I know if I need a new prescription for glasses?

[Logan]

Is there any sign for me to know I need a new prescription?

[Christopher]

Actually, you should have an eye exam every two years and when you are over 40, you should have an eye exam once a year to check other eye diseases accompany with age. If you have blurry vision or headaches even with your eyeglasses on, those may be the signs to have a new prescription.

[Joseph]

If you can't see as clearly as before with your current glasses and you always find things blurry, then it is a sign that you need a new pair of glasses. So you should go to see your doctor and have an eye exam.