Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1981-04-13
1984-09-18
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
G02C 706
Patent
active
044720360
ABSTRACT:
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 embodiment 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.
REFERENCES:
patent: 4274717 (1981-06-01), Davenport
patent: 4307945 (1981-12-01), Kitchen et al.
DeCarle, J. T.; "Bifocal and Multifocal Contact Lenses"; Contact Lenses; vol. 2, 1981; pp. 571-591.
Corbin John K.
Kabushiki Kaisha Hoya Lens
Sugarman Scott J.
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