An eyeglass assembly for training golfers includes first and second lenses that are opaque except at first and second viewing portions. The first viewing portion on the first lens provides a first eye of the user with a view of the target in a target region, such as the golf ball, while the second viewing portion provides a second eye of the user with a view not including the target region. An opaque feature such as a horizontal line is also provided on the second lens such that the eyes of the user co-register the horizontal line with the first viewing portion to form a focus point that must be maintained on the golf ball if head movement is to be avoided during a swing. The opaque portions at the remainder of the assembly prevent visual distractions that may undesirably move the eyes and the head during the swing.