| 摘要 |
Swimming or diving goggles comprising a one- or two-curved-lens system having a progressive cornerless curvature of cylindrical type with vertical axes and variable radius, without curvature in the vertical plane and described by a peculiar geometrical law, according to which the front portion located in front of the user's eyes has a curvature radius not less than 130 mm, and the two lateral portions have a lower curvature radius, anyway not less than 25 mm. The distance of the lens or lenses from the user's face is extremely reduced and such that two rays coming out from the eyes and lying on the horizontal plane intersect the lens or lenses at two point such that the perpendiculars to the inner surface of the lens or lenses at those two points form an angle not greater than 30 DEG therebetween.
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