I understand that this is valid until it is revoked by me. I understand that I may revoke this consent at any time by giving written notice of my desire to do so to Grassi Retina MD SC. I also understand that I will not be able to revoke this consent in cases where the physician has already relied on it to use or disclose my Protected Health Information. Written revocation of consent must be sent to Grassi Retina MD SC 1012 95th street Naperville, IL 60564.