For the purposes of the regulations contained in this Chapter, the term:
(d) “Engaging in the business of a dispensing optician” means the filling of prescriptions of licensed physicians and surgeons or optometrists for prescription lenses, and as incidental to the filling of such prescriptions:
(1) Using a keratometer to measure the curvature of the cornea of the eye;
(2) Converting a compounded prescription for spectacle lens by means of an algebraic formula in order to (a) compensate for the different vertex distance between the eye and the refractionist's test lens and between the eye and lens actually dispensed or, (b) to determine the appropriate power of contact lenses in accordance with such prescription;
(3) Taking facial measurements, fitting and adjusting prescription lenses, and fitting and adjusting spectacle frames.