Whether or not you wear glasses, get eye exams every other year if you’re between ages 21 and 40. Contact lens wearers and anyone over 40 should get checkups every year. These exams should include dilation, where your eye doctor uses drops to widen your pupils to look inside for any damage or disease. Many common eye diseases, such as glaucoma or retinal problems due to age or diabetes, give no early warning signs. Some experts say young kids should have a complete eye exam at age 3, another one before first grade, and then every two years thereafter.