| 摘要 |
A water sportsman's face mask for enabling a person swimming on or below the surface of a body of water to view objects in the opposite direction to his normaI line of vision. The mask comprises a frame, a lens mounted in the front portion of the frame, a flexible seal attached to the rear of the frame for forming a water-tight seal between the frame and the face of the swimmer, an adjustable strap for attaching the mask to the swimmer's head, and at least one prism in front of the lens having a pair of complementary faces which are inclined to the lens and internally reflect rays from objects behind the swimmer into his forward field of vision. In a second embodiment, a module is mounted on the front of a mask and has a pair of prisms, each having one member of a pair of complementary inclined faces for viewing objects behind a swimmer.
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