O-6, r. 3 - Code of ethics of dispensing opticians
3.03.05. A dispensing optician may not cease to act on behalf of a client, except on legitimate and reasonable grounds, among which are the following, in particular:
(a) loss of the client’s confidence;
(b) the fact that the dispensing optician is in conflict of interest or in a situation such that his professional independence could be questioned;
(c) the fact of being encouraged by the client to act illegally, unfairly of fraudulently.
Decision 83-02-09, s. 3.03.05.