Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1986-12-29
1988-11-15
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351167, G02C 706
Patent
active
047844825
ABSTRACT:
A multifocal spectacle lens is described with a high positive focal power, with a convex front surface which comprises an aspheric focal portion with an additional near segment, a transition zone surrounding the focal portion and a rim zone, and with an inside surface which forms an afocal margin together with the rim zone. The multifocal spectacle lens according to this invention is characterized by the fact that the near segment has an aspheric design and is separated from the focal section above it by a dividing line which has an approximately straight course. The main meridian of the near segment carries over into the main meridian of the focal section above it continuously and practically without any jump. In an advantageous further design of the spectacle lens according to this invention, an aspheric intermediate portion is provided between the near segment and the distance portion being separated from the distance portion by a dividing line with an approximately straight course and whose vertical main meridian also carries over into the main meridian of the distance portion continuously and practically without any jump.
REFERENCES:
patent: 2410145 (1946-10-01), Bardwell
patent: 2518099 (1950-08-01), Tillyer
patent: 3169247 (1965-02-01), Davis et al.
patent: 4073578 (1978-02-01), Welsh
patent: 4181409 (1980-01-01), Whitney et al.
patent: 4185897 (1980-01-01), Frieder
patent: 4504128 (1985-03-01), Guilino et al.
Koetting, R. A; "Progressive Addition Spectacles over Contact Lenses in Aphakia"; Am. Jour. of Optometry and Archives; vol. 46, No. 6; Jun. 1969; pp. 470-475.
Corbin John K.
Optische Werke G. Rodenstock
Sugarman Scott J.
LandOfFree
Multifocal spectacle lens with high positive focal power does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multifocal spectacle lens with high positive focal power, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multifocal spectacle lens with high positive focal power will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1100586