6 months -18 years Every 2 – 4 years 19 - 39 years Every 3 – 5 years 40 - 64 years Every 2 – 4 years 65 and older Every 1 – 2 years Here’s the symptom checker: http://www.mayoclinic.org/symptom-checker/vision-problems-adult/related-factors/itt-20009075Recommended...