Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Reexamination Certificate
2001-12-11
2003-04-29
Sugarman, Scott J. (Department: 2873)
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
C351S16000R
Reexamination Certificate
active
06554427
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to ophthalmic lenses. In particular, the invention provides lenses with surfaces designed using Chebyshev polynomials.
BACKGROUND OF THE INVENTION
The use of ophthalmic lenses including, without limitation, contact lenses for the correction of ametropia is well known. A number of known methods exist for approximating the shape of the lens' surface. For example, it is known to use splines, sine and cosine functions, exponential functions and logarithmic functions to define all or a part of a lens surface. However, the use of splines is disadvantageous in that some spline functions can become unconstrained at their outermost points resulting in oscillations between points. The other functions are problematic in that the ability to approximate a surface is limited by the equation used. Therefore, a need exists for a fitting method that overcomes some or all of these disadvantages.
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Collins Michael J.
Davis Brett A.
Iskander Daoud R.
Roffman Jeffrey H.
Gianneschi Lois
Johnson & Johnson Vision Care Inc.
Sugarman Scott J.
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