Patent ID: 7338159

Claim:
An adjustable focus lens system for adjusting focus in a viewing direction, said adjustable focus lens system comprising: A) at least one lens unit, with each of said at least one lens unit comprising a first lens element and a second lens element, with each of the first and second lens elements having at least one specially designed surface such that adjustments of the relative positions of said first and said second lens elements in a direction perpendicular or approximately perpendicular to a viewing direction results in changes in the combined focusing power of the two lens elements and B) an adjustment mechanism for moving in each of said at least one lens unit at least one of the lens elements relative to the other lens element in a direction perpendicular or approximately perpendicular to the viewing direction, so as to adjust the focusing power of the at least one lens unit; wherein said at least one lens unit is two lens units combined to make a pair of eye glasses and said adjustment mechanism is chosen from a group of adjustment mechanisms consisting of: 1) an adjustment mechanism adapted to be operated by a finger force against a friction force to slide one lens element in each lens unit relatively to the other lens element in the lens unit, 2) an adjustment mechanism comprising a two or three position lever adjustment adapted to be operated manually, 3) an adjustment mechanism comprising a support frame and two separate frames holding the lenses that pivot about pivot points on the earpiece of the support frame, 4) an adjustment mechanism comprises two rear lenses are mounted in a support frame and two front lenses mounted in a separate frame that pivots about a point on an earpiece of the support frame, 5) an adjustment mechanism comprises a pivor bar adapted to pivot produces lateral displacement of the lenses relative to each other when the torsion bar is twisted, 6) an adjustment mechanism having a control means adapted to assure that the relative movement of the lens elements in each lens unit is the same or approximately the same, 7) an adjustment mechanism having a torsion bar adapted to assure that the relative movement of the lens elements in each lens unit is the same or approximately the same, 8) an adjustment mechanism having a guide means for guiding the movement of the lens elements in each lens unit to assure that the movement of each lens element is in a direction approximately perpendicular to a viewing direction, and 9) an adjustment mechanism having a guide means for guiding the movement of the lens elements in each lens unit to assure that the movement of each lens element is in a direction mapping an arc of a circle approximately perpendicular to a viewing direction.