Abstract: Ophthalmic spectacle lenses with spherical powers between -0.25 and -12.00 diopters and cylindrical powers between -0.25 diopters and -4.00 diopters are disclosed. The lenses are provided with a convex spherical anterior surface and a concave aspherical posterior surface which also includes a correction for ocular astigmatism. The form of the posterior surface is determined by optimizing the aspheric curve along each principal meridian of the aspheric surface. The curve along each meridan of the posterior surface is described by the general equation:x=Ay.sup.2 +By.sup.4 +Cy.sup.6 +Dy.sup.8 +Ey.sup.10 . . .whereA determines the surface power of the curve at the vertex and is given by: ##EQU1## where F.sub.o is the required surface power of the curve at its vertex;n is the refractive index of lens material; andp is the eccentricity of the conic section at the vertex where p=1-e.sup.2, and e is the eccentricity of the aspheric surface.

Abstract: The present invention relates to a multifocal ophthalmic lens which comprises a first substantially spherical area for distance viewing, a second substantially spherical area for near viewing having a desired width and height and being surrounded on a plurality of sides by the first area, and relatively narrow areas intermediate the first and second areas for blending the second area into the first area. The lens design of the present invention may also include an optional third substantially spherical area adjacent the second area for increasing the near viewing range in a substantially contiguous manner.

Abstract: The present invention relates to a multifocal ophtalmic lens which comprises a first substantially spherical area for distance viewing, a second substantially spherical area for near viewing having a desired width and height and being surrounded on a plurality of sides by the first area, and relatively narrow areas intermediate the first and second areas for blending the second area into the first area. The lens design of the present invention may also include an optional third substantially spherical area adjacent the second area for increasing the near viewing range in a substantially contiguous manner.