A vision apparatus may include a first longitudinal base member, a second longitudinal base member which substantially mirrors the first longitudinal base member, a traverse member to connect the first and second longitudinal base member, a pointer member being positioned on the traverse member. The longitudinal base member may include a inclined tower surface, and the longitudinal base member may include a mounting post. The mounting post may cooperate with a rail, and the pointer member may be detachably connected to the traverse member. The first longitudinal base member may include a tower member to cooperate with the rail member, and the vision apparatus may include a tower member to connect the longitudinal base member and the traverse member. The tower member may be detachably connected.