well, i say it doesn't because its go no relevance to aviation vision physiology, and if they say its not approved, then i would say that the caa have been running a test, dare i say this but, illegally... you think of the hundreds, maybe thousands of people that have done cad, only to find they have received a night rating, or started a cpl, or frozen atpl course, only to find there medical to be revoked. just my personal view, people, but a to the point one...