Send successful results to the FAA and you will be issued an amended certificate without the night flight/color signal restriction. The alternative test may be administered by an ophthalmologist or optometrist of your choice. The attached sheet from the Guide for Aviation Medical Examiners lists the optional tests and requirements for satisfactory completion based upon the class of medical applied for. (1) The more desirable option that does not result in the issuance of a waiver is the successful completion of an FAA-approved alternative test. If the airman does not pass the color vision test administered in the Aviation Medical Examiner's office at the time of the FAA physical examination, the following options are available to remove the restrictions from the medical certificate: The newly revised standards in Part 67 specify that applicants for all classes of medical certification have "the ability to perceive those colors necessary for the safe performance of airman duties." Procedure for removal of color vision restriction Here are the details for removal of the restriction as per AOPA (US) That may be a little bit out of your way. I did my Titmus vision test at my ame's office in Irvine California. But you should go along to an airport before hand and ask the nice people in the tower if they could help you out by flashing the same lantern at you so you know if you are wasting your time or not. Pass a signal light gun test at an FAA FDSO. This results in a letter of competency stating that you meet the standards laid out in the FAR's. I will copy them to the end of this post. Pass one of the alternative tests listed by the FAA.