The present invention provides a contact lens having an orientation/stabilization and optionally translation feature that does not provide an prism optical distortion and can effectively maintain a predetermined orientation of the lens on an eye. Like a conventional lens ballast, the orientation feature of the invention works by weighing the lens at its lower half portion, causing it to come to an equilibrium position on the eye. With such orientation feature, the optical zone of the anterior surface can be designed independently to provide an optimal visual performance.

The present invention provides a contact lens having an orientation/stabilization and optionally translation feature that does not provide an prism optical distortion and can effectively maintain a predetermined orientation of the lens on an eye. Like a conventional lens ballast, the orientation feature of the invention works by weighing the lens at its lower half portion, causing it to come to an equilibrium position on the eye. With such orientation feature, the optical zone of the anterior surface can be designed independently to provide an optimal visual performance.

Multifocal ocular lens (10, 30) including a central vision correction region (14) having a first optical power value (Pa), an outer vision correction region (16) spaced radially outwardly from the central vision correction region and having a second optical power value (Pd) different from the first optical power value, and an intermediate vision correction region (18) located radially intermediate between the central and outer vision correction regions and having a distribution of optical power between the first and second optical power values, and wherein the intermediate region (18) has a first transition point (20) and a second transition point (22) which is not radially inwardly spaced from the first transition point, such that the distribution of optical power of the intermediate region includes two optical power values (Pb, Pc) which are defined by the first and second transition points, respectively, and which are determined such that the optical power value (Pc) defined by the second transition point (22) is closer to the first optical power value (Pa) of the central region (14) than the optical power value (Pb) defined by the first transition point (20).

A multifocal ocular lens having a vision correction area (12) including at least one distant vision correction region (16, 18) having a first optical power value for distant vision correction and at least one near vision correction region (16, 18) having a second optical power value for near vision correction, wherein the vision correction area (12) further includes a central intermediate-distance vision correction region (14) which has a third optical power value (Pa) for intermediate vision correction between the first and second optical power values (Pb, Pc) and which is located in a central portion of the vision correction area such that the distant and near vision correction regions (16, 18) are located radially outwardly of the central intermediate-distance vision correction region.

A toric multifocal lens (10, 26) including a plurality of vision correction regions (12, 14, 28, 30) having centers on a common optical center axis, the plurality of vision correction regions providing respective different values of a spherical optical power, each of the plurality of vision correction regions having an optical power for correction of astigmatism, wherein the improvement comprises: at least one of a cylindrical optical power and a cylindrical axis orientation which determine the optical power for correction of astigmatism being different in at least two different vision correction regions of the plurality of vision correction regions, so that the at least two different vision correction regions have respective different values of the optical power for correction of astigmatism.

A multifocal ocular lens having a vision correction area (12, 112) which consists of a central, an intermediate, and an outer vision correction region (14, 16, 18; 114, 116, 118) having respective different values of an optical power, and which has an optical axis with which centers of the central and outer vision correction regions are aligned, the central and outer vision correction regions having respectively determined first and second mutually different values of the optical power, wherein the optical power of the intermediate region (16) is represented by a combination of a first and a second quadratic curve connected to each other at a point of inflection which corresponds to a radial position of a boundary between the inner and outer sections, and which corresponds to a desired third value of the optical power between the first and second values, or the optical power of the intermediate region (116) is represented by one polynomial equation whose degree "exp" is not smaller than 2 and continuously changes from the first value to the second value with an increase in a radial distance from the optical axis.

The present invention provides a contact lens having novel myopia progression suppression capability, while enabling a good QOV to be obtained and ensuring myopia is kept from progressing. A contact lens (10) having a refractive correction power for correcting myopia and myopic astigmatism set in a central region (32) of an optical part (24), wherein a positive addition power in comparison with a power in the central region (32) is set in a peripheral region (34) of the optical part (24) so that progression of the myopia or myopic astigmatism is suppressed, a positioning means (46) is provided that specifies a circumferential position of the lens under a worn condition, and a lens optical axis (18) of the optical part (24) is set offset from a lens geometric center to align with a line of sight (16) of a human eye (14) under the worn condition produced by the positioning means (46).

The present invention provides a contact lens having an orientation/stabilization and optionally translation feature that does not provide an prism optical distortion and can effectively maintain a predetermined orientation of the lens on an eye. Like a conventional lens ballast, the orientation feature of the invention works by weighing the lens at its lower half portion, causing it to come to an equilibrium position on the eye. With such orientation feature, the optical zone of the anterior surface can be designed independently to provide an optimal visual performance.