Wide viewfield underwater mask

A wide viewfield underwater mask comprising:

• a main body with a resilient member conforming to the diver's face at the eyes and nose area and with a symmetry mid-axis at the nose;
• a base frame connected to said resilient member and provided with an opening at each of the diver's eyes, said openings being bound by an upper edge, a lower edge, and inner and outer side edges which define a symmetrical contour about said symmetry mid-axis and lying in a substantially perpendicular plane to the diver's sight axis;
• a transparent eye-plate holding half-frame for each of said openings provided with an edge defining a contour fitting within that of the corresponding opening of the base frame;
• a first connection means for securing each half-frame tightly on the base frame at its associated opening;
• first and second openings on each half-frame bound by respective contour edges;
• said first opening lying in a substantially perpendicular plane to said sight axis, and said second opening lying in a plane forming an angle greater than 90.degree. and less than 180.degree., with that of the first opening and extending toward the lower edge of the corresponding opening of the base frame;
• first and second transparent plates respectively fitting within said first and second openings of each half-frame;
• and
• a second connection means for securing said first and second transparent plates tightly in their respective first and second openings of each half-frame.