15 U.S. Code § 7604 - Expiration of contact lens prescriptions
If a prescription expires in less than 1 year, the reasons for the judgment referred to in subsection (a)(3) shall be documented in the patient’s medical record. In no circumstance shall the prescription expiration date be less than the period of time recommended by the prescriber for a reexamination of the patient that is medically necessary.
As used in this section, the term “issue date” means the date on which the patient receives a copy of the prescription.
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