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This refers to the power of the lens implant that was placed in your eye. The D stands for Diopters, which is a unit of measurement of power that the lens implants are measured in. An average power for an implant is approximately 20 diopters. Does that make sense?
I don't know exactly how much, but I suspect it is likely around $28. I'm not an employee of the website, but am an end user like yourself who is just an expert answering the questions. I suspect it would show up on your credit card in the next 24-72 hours. Do you have any other questions about this?
From what I can to all, that's correct. Just because you pay for the answer to this one question, does not mean you're signed up for the service. Ultimately, though, you need to contact the customer service for this website to make sure.