Okla. Stat. tit. 59, § 59-646.4: Twelve-month minimum for contact lens prescriptions

Unless a health-related reason for the limitation is noted in

the patient's medical records, contact lens prescriptions shall not

have an expiration date of less than twelve (12) months from the

date the prescription is authorized or the last date of the contact

lens evaluation by an Oklahoma-licensed optometrist, whichever date

is later. In no event shall a contact lens prescription be valid

twelve (12) months after the date of authorization by an Oklahoma-

licensed optometrist.