The eyes vary with the adaptions of each species, but overall fish have a strong vision sense, similar to us. They can focus, have day and night vision (rods an

The eyes vary with the adaptions of each species, but overall fish have a strong vision sense, similar to us. They can focus, have day and night vision (rods and cones), most see in color and some can see into the UV spectrum. So, in the vision department, fish are capable. I don't know how much a fish navigates the space based on vision alone (and I don't think it plays a big role, since visibility underwater is limited), but I know some from the Cichlidae family like the Oscar are able to recognize it's owner, which is quite a feat.