Water sportsman's face mask for viewing objects in the opposite direction of the normal line of vision

A face mask for viewing object behind a forward facing swimmer comprising:

• a frame, a lens mounted din the front portion of said frame;
• a flexible member attached to the rear portion of said frame for sealing said frame against the face of a swimmer;
• a lens mounted int eh open front portion of said frame for enabling said swimmer, when facing forwardly, to view objects ahead of said swimmer int eh direction of the normal lien of visions of said swimmer;
• a means for attaching said mask to the head of said swimmer;
• and a pair of double reflecting prisms mounted on the front of said mask substantially at the eye level of said swimmer, each of said prisms having a first vertical planar face which is adjacent to said lens, a second vertical planar face which is in inclined relationship to said first vertical planar face and extend outwardly and forwardly from said first vertical planar face;
• a third vertical planar face which is in inclined relationship to said first vertical planar face and extends outwardly and rearwardly from said firs vertical planar face;
• a fourth vertical planar face which interconnects said second and third vertical planar faces;
• and fifth and sixth horizontal planar faces which interconnect said other four vertical planar faces.