Casting looks like effort, pulling a lot of line out, flicking the rod back and forth, then a momentous cast, hopefully right above a fishy nose. No, you don't. The eyes of a trout produce a significantly different view of the world than the eyes of a fly fisher. The physiology of a trout's eye is different than a human eye and produces different results. Understanding what trout do and don't see will help you catch more fish.
Trout definitely see color.
In fact, there is evidence to support that they see farther into both the infrared and ultraviolet spectrum than we do. This is especially true when they are fingerlings and again at spawning time. Because trout see color so well, bright colors such as whites, reds, yellows, pinks, etc., that are not often found in a trout's natural habitat, tend to spook them pretty quickly. Few things will send a trout scurrying for cover quite as quickly as a brightly colored hat, especially in slow-moving clear water. Trout also have binocular vision in a 30 cone directly in front of them, which allows them to judge distance easily and accurately.