Contact lens for correction of ametropia associated with...

Details Contact lens for correction of ametropia associated with... Contact lens for correction of ametropia associated with...

G - Physics

02

C

88/40

G02C 7/04 (2006.01)

Patent

CA 1118248

HYDROGEL CONTACT LENS ABSTRACT OF THE DISCLOSURE A soft contact lens provided with a front surface whose cross section describes the curve whose equation, in polar coordinates, is ? = R + kR(l - cos.theta.)/(l+ cos.theta.) where R is the radius of curvature of a spherical lens of power equal at least approximately to the most hyperopic (or least myopic) power meridian of the ametropia plus about one-half of any presbyopic addition required by the patient, and k is a constant of eccentricity which may vary with the hydrophilic properties of the lens material and is determined for each material such that the visual acuity for distance and near vision is 20/20 or better with the aforesaid R value. The value of k lies within the range 0.005 to 0.1.

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