3.05.13.In the practice of his profession or in view of such practice, a dispensing optician may not conclude a contract limiting or controlling the management of his office or his professional practice. In particular, he must never contract to:
(a) use a form of advertising contrary to the Professional Code (chapter C-26), to the Dispensing Opticians Act (chapter O-6) or to the regulations thereunder;
(b) exclude certain types or brands of ophthalmic ortheses from those he offers to the public;
(c) limit his freedom to buy and sell;
(d) define or restrict the professional services that he may offer to the public.