For which class of medical certification can only second or third class be granted to individuals with colorblindness?

The correct answer is that individuals with colorblindness can only be granted a second or third class medical certificate. In aviation medical standards, color vision is particularly critical for certain flight operations, especially for first class certification, where pilots need to meet stricter visual acuity requirements that include the ability to distinguish colors.

Individuals who are colorblind are typically unable to meet these specific requirements necessary for first class certification due to the potential dangers associated with misinterpreting cockpit lights and signals, which can be critical in the safe operation of an aircraft. Thus, while second and third class medical certificates may be issued to individuals with colorblindness under certain circumstances, the inability to meet the color vision standards disqualifies them from obtaining a first class medical certificate.