Method for producing bifocal contact lenses

Details Method for producing bifocal contact lenses Method for producing bifocal contact lenses

1989-12-26

1991-12-24

Smith, James G.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51326, 51327, B24B 1300

Patent

active

050740822

ABSTRACT:
A method for producing a bifocal contact lens comprising, in combination, the steps of generating a first, concave surface on a first side of a lens blank eccentrically mounted in concave surface cutting means, wherein the center of curvature of the concave surface lies on an axis offset from the optical center axis of the lens blank by a prism offset distance; generating a second, convex surface on the second side of the lens blank, wherein the center of curvature of the convex surface lies on the optical center axis of the lens blank; generating a third, convex surface on the second side of the lens blank eccentrically mounted in convex surface cutting means, wherein the center of curvature of the third, convex surface is coaxial with the second, convex surface; trimming the first, concave surface to form a fourth, concave surface on the first side of the lens blank the curvature of the fourth surface corresponding to the base curve; and finishing the lens by known methods. If desired, the posterior optical zone may be decentered by eccentrically mounting the lens blank in edge curve cutting means prior to cutting the edge curves.

REFERENCES:
patent: 4199231 (1980-04-01), Evans
patent: 4202848 (1980-05-01), Neefe
patent: 4239712 (1980-12-01), Neefe
patent: 4322517 (1982-03-01), Deubzer et al.
patent: 4618229 (1986-10-01), Jacobstein et al.
patent: 4854089 (1989-08-01), Morales

Affiliated with

Also associated with

Rating

Method for producing bifocal contact lenses does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for producing bifocal contact lenses, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing bifocal contact lenses will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-37050