Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Floating or underwater type
Patent
1995-06-05
1996-06-04
Sikes, William L.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Floating or underwater type
351 41, G02C 100
Patent
active
055238041
ABSTRACT:
An underwater diving mask, including a preformed face piece of suitable material so as to yieldably fit the contour of a wearer's face, and a strap for holding the face piece against the wearer's face. The mask has at least one large opening formed in the forward part thereof, and a rigid plate-like supporting structure carried by the face piece closing the opening. In one embodiment a pair of reducing, single sided concave lenses, one for each eye of the user, are formed in side-by-side relationship in the supporting structure. In another embodiment there is a single plate which is itself a single reducing lens. In yet another embodiment two openings and two lenses are provided, each a reducing lens. So as to properly compensate for the foreshortening effect of the water, the reducing power of the lens system is between zero and -0.50. The supporting member and lenses are prepared directly or treated or coated, such as by dipping, with a coloring agent. This is to inhibit passage through the lenses of certain wavelengths of light in order to correct the color distortion inherent in underwater viewing, and/or to provide protection from dangerous radiations.
REFERENCES:
patent: 3051957 (1962-09-01), Chan
Dang Hung Xuan
Sikes William L.
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