To operate your boat correctly as a captain, it’s crucial to have good color vision. A color vision test is an eye examination that assesses your ability to see colors. There are two types: the Ishihara test and the Farnsworth-Munsell 100 Hue Test. In the Ishihara test, a series of images contain dots of various colors. You have to identify the numbers or shapes hidden within the image. If you have trouble seeing the numbers or shapes, it may indicate a problem with your color vision. The Farnsworth-Munsell 100 Hue Test can help identify more subtle color vision deficiencies. In this test, you must arrange a set of colored disks from light to dark. Trouble seeing color differences may also indicate a problem with your color vision.