Aspheric toric lens designs

G - Physics – 02 – C

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

G02C 7/06 (2006.01) A61F 2/16 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2175653

Aspheric toric lens designs are disclosed which reduce the number of cylindrical axis locations required for stock keeping units in inventory by aspherizing the toric surface thereof. The present invention pertains to ophthalmic lenses, and in particular to contact lenses such as soft hydrogel contact lenses, particularly designed to fit astigmatic patients who are either non-presbyopic or presbyopic. One of the front and back surfaces of the aspheric toric lens defines a spherical surface corresponding at least to the patient's basic distance prescription Rx. The other of the front and back surfaces defines an aspheric toric curve, wherein the toric surface is constructed with aspheric radii, such that the aspheric curve desensitizes axial misalignment of the toric curve by providing an enhanced depth-of-focus. When the aspheric toric surface is on the back surface of the lens, the spherical curve on the front surface of the lens can comprise a single spherical curve corresponding to the patient's basic distance prescription Rx. When the aspheric toric curve is on the front surface of the lens, the spherical curve on the back surface of the lens can comprise a multifocus concentric annular ring spherical surface design.

LandOfFree

Say what you really think

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

Rating

Aspheric toric lens designs does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Aspheric toric lens designs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aspheric toric lens designs will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1921576

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