BAR HARBOR, Maine (AP) -- Researchers at the University of Florida and The Jackson Laboratory in Maine say they used gene therapy to restore sight in mice with achromatopsia, a form of hereditary blindness that also strikes humans.In a paper published online in Tuesday’s edition of Nature Medicine, the Florida scientists working with Jackson research scientist Bo Chang describe their use of a harmless virus to deliver corrective genes to mice with a genetic impairment that deprives them of vision.