<prompt> Human: I recently received a letter from my Optometrist that highlighted some services that were not covered by my insurance which needed to be paid for. In the footer, there is a cut-off section where he requests me to write in my credit card information credit card company, credit card , CVV , expiration date. The intent is for me to cut off the section and mail it back to him for payment.My question is if this is a safe way to go about things? This letter caught me off guard because I am used to entering my credit card information for online vendors like Amazon or eBay, but I feel those are safer because of encryption, and the fact that online payments are easily traceable. I can easily go to the optometrist and handle the payment in person, but they might request to store my credit card information in paper form again.Any help would be appreciated!UPDATE: Thanks for the helpful replies! The bill looked suspiciously high for a routine eye exam, and I realized they charged me for some vision tests that my vision insurance should cover. However, they directly invoiced my medical insurance, which was only able to cover a portion of those vision tests. When I called my vision insurance, they explained they were never invoiced those tests by the optometrist. What ended up happening was that my optometrist added on tests outside of a typical vision package covered by insurance, and her justification was that I signed a waiver so that they can perform tests to go above and beyond what normal optometrists do. The waiver was located at the bottom of a required form where you fill in pre-existing medical symptoms, had no disclaimer that the waiver was optional, and no written way to decline the waiver. You had to physically go to the front desk and tell them you do not want additional testing. Obviously, I was very upset so eventually they lowered the bill to the co-pay amount that would normally be required by my vision insurance. It may be my fault for not inquiring more about the waiver, but they sure abused the hell out of a psychological default option.  <response>: That didnt take long...used to be people didnt trust online forms and only wanted to use the paper ones.You can trust the paper form as much as you trust your Optometrist.If you dont actually trust him then just go by and pay cash, I suppose? 