A St. Paul man is upset because his optometrist refused to approve a recent request for contact lenses. The doctor's excuse: The patient hadn't been examined in 18 months, and his prescription was good for only one year. Under state law, any contact lens prescriptions "must expire two years after it is written, unless a different expiration date is warranted by the patient's ocular health." Under the law, doctors must provide reasons for providing anything less than a two-year prescription during the exam. Our reader said his doctor failed to explain the one-year prescription. Have you received a contact lens prescription good for less than two years? Click here for the language of Statute 145.712, subdivision 2, which was enacted in 2002.