US 5,173,723 A · Aspheric ophthalmic accommodating lens design for intraocular lens and contact lens

Abstract

A multifocal lens configuration is disclosed having a lens body with first and second surfaces wherein at least one of the surfaces is defined three dimensionally as being rotationally non-symmetric about the optical axis of the lens. The lens surface may be described and modeled as having angular zones or sectors of differing curvature responsible for near, intermediate or distance vision or combinations thereof. The lens surface is defined by a plurality of individually defined semi-meridian sections radiating centrifugally from the apical umbilical point or polar axis of the lens surface, wherein each of the semi-meridian sections are tangent to one another at the apical umbilical point and form a continuous smooth surface in conjunction with one another. Each of the semi-meridian sections may be differently and uniquely shaped, and are defined according to shape and magnitude, wherein the semi-meridian sections within an angular zone may be constant or may vary in a continuous and regular manner. The lens configuration will provide an accommodative affect simulating that of the non-presbyopic phakic eye over a full range of distance regardless of the size of the pupillary aperture. The lens configuration can be used in the design on an intraocular lens wherein one or both surfaces of the lens body is provided with the novel surface, or alternatively in contact lens design in a similar manner.

Claims22

Dependent claims

A multifocal lens configuration providing correction of the refractive error and accommodative insufficiency of the eye, comprising;

a lens body having first and second surfaces, wherein at least one of said surfaces is defined as being a rotationally non-symmetrical aspheric surface, said aspheric surface varying in curvature and refractive power rotationally about the apical umbilical point of the lens surface at which the derivative of curvature vanishes, with the surface contour defined by a continuum of mathematically defined semi-meridian sections tangent to one another at said apical umbilical point and which together form a continuous surface that includes at least four defined angular zones of predetermined curvature, wherein the semi-meridian sections in each of said at least four defined angular zones are varied in a predetermined manner to provide clear vision over ranges of near, intermediate, or distance vision.

A multifocal lens configuration providing clear central vision at various distances and correcting the refractive error of an eye, comprising;

a lens body having first and second surfaces, wherein at least one of said surfaces is modeled as having a plurality of angular zones including at least one distance vision zone, at least two intermediate vision zones, and at least one near vision zone, each of said zones defined by a plurality of predetermined semi-meridian sections which together form a continuous surface, wherein said semi-meridian sections defining each of said plurality of angular zones extend from the apical umbilical point of said at least one surface at which said semi-meridian sections are tangent and the derivative of curvature of the surface vanishes, such that each of said plurality of angular zones has predetermined refractive properties wherein said at least two intermediate vision zones lie between the adjacent to said at least one near and distance vision zones, with said semi-meridian sections defining said intermediate zones varying progressively in curvature from the adjacent semi-meridian section within said at least one adjacent distance vision zone to the adjacent semi-meridian section within said at least one adjacent near vision zone, such that said plurality of angular zones contribute to the correction of refractive error of an eye and together provide clear central vision over a range of distances from near to far.

Dependencies are inferred from the claim text.

Aspheric ophthalmic accommodating lens design for intraocular lens and contact lens

Life of this patent

Aspheric ophthalmic accommodating lens design for intraocular lens and contact lens

Life of this patent

Abstract

Claims22