Monofocal ophthalmic lens having two aspherical surfaces
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 15, 2001
Grant Date -
N/A
app pub date -
Dec 22, 1999
filing date -
Oct 28, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A monofocal ophthalmic lens having a front and a rear surface, each of which is aspherical, of which at least one surface has identical radii of principle curvature in the apex. The average surface refracting power of at least one of the front and rear surfaces is defined by the formula: B.sub.f =(n-1)/2*(1/R.sub.1 +1/R.sub.2) wherein n: is the refractive index of the lens medium, R.sub.1 : is the radius of principle curvature 2 in a point of at least one of the front and rear surfaces in a first principle plane, and R.sub.2 : is the radius of principle curvature 2 in the point of the at least one in the front and rear surfaces in a second principle plane, and wherein the average surface refracting power of points on the at least one of the front and rear surfaces is the function of the distance h at constant azimuthal angle of .OMEGA. of each point from the apex, and the function includes an extreme value and/or a value 0.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully