Progressive multi-focal lenses

Details Progressive multi-focal lenses Progressive multi-focal lenses

G - Physics

02

C

88/41

G02C 7/06 (2006.01) G02B 3/10 (2006.01) G02C 7/02 (2006.01)

Patent

CA 1149208

ABSTRACT OF THE DISCLOSURE A progressive multi-focal lens is provided of the type having a distant viewing zone, a near viewing zone, and a progressive zone therebetween. The surface refractive power increases vertically from an upper portion of the lens to a lower portion as the line of sight scans from a distant view to a near view. Side zones are provided beside the progressive and near viewing zones. The side zones are spheric surfaces, with a dioptric refractive power in accordance with one embodi- ment being the arithmetic mean value of the refractive power of the near and distant viewing zones. This eliminates astigmatism problems in the side areas and permits normal side sight.

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