Which means it does not reach final test until it is coated either. Anti-reflective coating can change how a lens behaves under impact. That is why the impact test has to come after the coating goes on, not before. The standards are explicit about it. ISO 8980-4 requires at least twenty four hours to elapse after coating before any type test is carried out - an acknowledgement, written into the text, that a freshly coated lens is not yet a finished one. EN 168 and ISO 12312-1