What is the Rxd on a lens?

Excuse me, could you please clarify what you mean by "Rxd on a lens"? As someone who is knowledgeable in the field of cryptocurrency and finance, I'm not immediately familiar with this specific term in the context of optics or lens manufacturing. Could you possibly be referring to a technical specification or a measurement related to the lens, but perhaps in a different industry or field? If so, could you provide a bit more context or clarify what exactly you're looking for? Alternatively, if this question is unrelated to my area of expertise, I apologize for any confusion and would be happy to help in any way I can, given the proper context.