O-7, r. 5 - Code of ethics of optometrists

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33.1. Notwithstanding section 33, an optometrist is not in a conflict of interest if he accepts a discount from a seller for one of the following reasons:
(1)  for prompt regular payment, when the discount is indicated on the invoice and complies with marketplace rules for discounts;
(2)  due to the volume of products purchased other than medication, where the discount is indicated on the invoice or the account statement and complies with the market rules in similar situations.
O.C. 363-2008, s. 8.