Cover

Bank side and aquatic cover can impair the fish’s vision; consequently, use bank side brush to conceal you during your approach, and to hide your position. Because light refraction can sometimes allow fish to see around corners, fish may be able to see you when you cannot see them. (See Diagram 1)

By taking the fish’s vision window into account you can mask your approach by placing cover between you and the fish. But watch out for the light refraction phenomenon that permits fish to see around corners.