Patent ID: 7316478

Claim:
A pair of glasses, comprising: a pair of bifocal lenses, said lenses including a first portion of the bifocal lens for viewing objects at a first distance and a second portion for viewing objects at a second distance, wherein the second distance is closer than the first distance; a second pair of lenses for viewing objects at a third distance connected with the pair of bifocal lenses to move between a first position covering a lower portion of the first portion of the pair of bifocal lenses and a second position not covering any portion of the pair of bifocal lenses, the third distance being between the first distance and the second distance; and wherein when the second pair of lenses is in the first position a user is provided a first zone of vision through the first portion of the pair of bifocal lens not covered by the second pair of lenses for viewing objects at the first distance, a second zone of vision through the second pair of lenses covering the lower portion of the first portion of the pair of bifocal lenses for viewing objects at the third distance, and a third zone of vision through the second portion of the pair of bifocal lenses for viewing objects at the second distance.