This chapter may not be construed to
(1) limit or restrict a licensed physician or optometrist from the practices enumerated in this chapter, and each licensed physician and optometrist has all the rights and privileges that may accrue under this chapter to dispensing opticians licensed under it;
(2) prohibit an unlicensed person from performing mechanical work upon inert matter in an optical office, laboratory, or shop;
(3) prohibit an unlicensed person from engaging in the sale of eyeglasses, spectacles, magnifying glasses, goggles, sunglasses, telescopes, binoculars, or any like articles that are completely preassembled and sold only as merchandise;
(4) authorize or permit a licensee under this chapter to hold out as being able to, or to offer to, or to attempt by any means, to refract or exercise eyes, diagnose, treat, correct, relieve, operate, or prescribe for any human ailment, deficiency, deformity, disease, or injury;
(5) limit the authority of a nonprofit organization approved by the department to distribute and fit used eyeglasses if the eyeglasses are distributed and fitted free of charge and the fitting of the eyeglasses conforms, to the extent possible, with a written prescription from a licensed physician or optometrist.