Lens system for diver's mask

Details Lens system for diver's mask Lens system for diver's mask

1992-02-27

1994-10-25

Sikes, William L.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Floating or underwater type

2441, 2446, G02C 100

Patent

active

053593715

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 a 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 the plate itself is a single 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:
Optometrie Weekly vol. 52 pp. 1381-1385 Jul. 13, 1961 Mr. James R. Gregg.

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