Guide for Aviation Medical Examiners
2022-02-11 · Applicants for a third-class medical certificate need only take the Operational Color Vision Test (OCVT). The applicant is permitted to take the OCVT only once during the day. If the applicant fails, he/she may request to take the OCVT at night. If the applicant elects to take the OCVT at night, he/she may take it only once.