Notwithstanding the provisions of subdivisions 7 and 8 of § 54.1-3204, a licensed optician is authorized to prepare and dispense eyeglasses, spectacles, lenses, or related appurtenances, for the intended wearers or users, on prescriptions from licensed physicians or licensed optometrists; duplicate and reproduce previously prepared eyeglasses, spectacles, lenses, or related appurtenances; and, in accordance with such prescriptions, duplications, or reproductions, measure, adapt, fit, and adjust eyeglasses, spectacles, lenses, or appurtenances to the human face. A licensed optician shall not, however, duplicate a contact lens solely from a previously prepared contact lens.