Hello,...you are absolutely correct in your assessment. For many years I have supported my patient's decision to have my CL Rx purchased at discount marketers. I have not personally seen any negative effect from their purchases from independent sources.,,,,,,so to answer your direct question..." if there's any reason from an eye safety or other perspective that it's a mistake to buy the contacts from somewhere other than an optometrist's office."......the answer is go right ahead. Choose the best deal.....and......thanks for your question.