The following table gives the frequency for people with normal eyesight (those that don't need correction).

Age	Frequency
65 or older	Every 1-2 years
40-64	Every 2-4 years
20-39	Every 3-5 years

If you have vision problems, your ophthalmologist will tell you how often to schedule your eye exams. In any case, if you are experiencing new or increased vision problems, schedule an appointment right away.