Soft, tough low refractive index contact lenses

A soft, wettable, transparent contact lens for the eye constructed from at least one soft, tough, fluorine-containing polymer selected from the group consisting of tetrafluoroethylene/perfluoro(methyl vinyl ether), tetrafluoroethylene/perfluoro(methyl vinyl ether)/vinylidene fluoride, tetrafluoroethylene/perfluoro[2(2-fluorosulfonylethoxy)propyl vinyl ether], vinylidene fluoride/hexafluoropropylene/tetrafluoroethylene, and vinylidene fluoride/hexafluoropropylene said lens having a concavoconvex structure with the concave surface conforming substantially to the shape of the eye surface, an optical zone, a refractive index in the range 1.3 to 1.4, a Clash-Berg torsion modulus in the range about 95 to about 1000 pounds per square inch, a Shore Durometer (A) hardness of 90 or less, a tensile strength (break) of at least about 100 psi, an elongation (break) of at least about 160 percent and a tear strength of at least about 5 lb/linear inch.