Generally, if a person is going to purchase a pair of glasses, an up-to-date prescription is preferable. Very few vision providers will recommend that a person hold a prescription for more than a year without having it filled. We will give a patient a copy of a glasses prescription at any time when requested. We will, however, include the actual date that your vision was measured. It is then at the discretion of the optical practice whether they will fill a prescription that is older than a year.