Hi
from the following website CAAP from the Philippines
2.10.2.1.4 COLOR PERCEPTION REQUIREMENTS
(a) The applicant shall be required to demonstrate the ability to perceive readily those
colors the perception of which is necessary for the safe performance of duties.
(b) The applicant shall be tested for the ability to correctly identify a series of
pseudoisochromatic plates in daylight or in artificial light of the same color temperature such as that provided by CIE standard illuminants C or D2 as specified by the International Commission of Illumination (CIE). (c) An applicant obtaining a satisfactory result as prescribed by the Authority shall be assessed as fit. An applicant failing to obtain a satisfactory result in such a test shall be assessed as unfit unless able to readily distinguish the colors used in air navigation and correctly identify aviation colored lights. Applicants who fail to meet these criteria shall be assessed as unfit except for Class 2 assessment with the following restriction: valid daytime only.
pseudoisochrommatic plates= The Ishihara test is the first in a class of successful color vision tests called pseudo-isochromatic plates ("PIP")
you can check out this free online test: Google colorvisiontesting
As I dont have ten post I can not display links to the websites listed.