The frequency of required eye exams depends on age and condition of the eyes.
Young children should see their eye doctor for an exam approximately every two years. If a child already wears eyeglasses to improve their vision, a check-up is recommended every six months to a year.
Adults who do not wear eyeglasses are recommended to see an eye doctor every two to four years, and if they do wear glasses or contact lenses, an annual exam is required.

Yes. Your prescription is customized for your vision, and is a tool that will give you 20/20 vision when you use it. It is not reparative, though; which means that it won’t heal your vision to become perfect without it.