Multifocal spectacle lens

G - Physics – 02 – C

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

G02C 7/06 (2006.01) G02C 7/02 (2006.01)

Patent

CA 2201391

A multifocal spectacle lens has two optically effective surfaces with powers in the far reference point from -4.0 dpt to +4.0 dpt in the stronger principal section. The spectacle lens has cylinders from 0.0 dpt to 4.0 dpt and an addition of 1.00 dpt to 3.00 dpt. The multifocal area is at least aspherical and can be differentiated continuously at least twice and is not axial symmetrical. The multifocal surface includes a far vision zone, a near vision zone and a progression zone lying between the near and far vision zones. The lens body is configured to incorporate a plurality of features within an elliptical region on the surface of the lens body extending 50 mm measured horizontally and 40 mm measured vertically from the measurement point. These features are all satisfied together within the elliptical region. One of the features is that the near-reference point is at most 21 mm perpendicularly below the far-reference point and displaced by about 2.5 mm toward the edge. Also, a principal viewing line interconnects the far-vision zone and the near-vision zone and the principal viewing line defines a curve swung toward the edge more or less in dependence upon the dioptric power of the far-vision zone and the addition. A predetermined region is formed in the progression zone on both sides of the principal viewing line wherein astigmatic deviation is less than 0.75 dpt.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Multifocal spectacle lens 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, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multifocal spectacle lens will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1630349

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.