A method of designing an aspheric ophthalmic lens capable of reducing aberration of an eye, comprises: a step of modeling an optical system including a cornea and an ophthalmic lens by inclining the optical system about a rotation point by a predetermined angle in consideration of a displacement angle between an optical axis and a visual axis of the eye (1); a step of calculating aberration resulting from the modeled optical system; and a step of designing a shape of at least one of a front surface and a back surface of the ophthalmic lens to reduce the aberration resulting from the modeled optical system.

Disclosed is a contact lens (10) having a refractive power ranging from -15.0 to +15.0 diopters in an optical zone (18) thereof, wherein a back optical zone (12a) is a conical surface having a conic coefficient ranting from -0.04 to -0.49, and a front optical zone (14a) is a conical surface having a conic coefficient ranging from -0.02 to -0.50. The contact lens provides optical characteristics required in consideration of an optical system of an eye when being positioned at a position of rest during wear in which an optical axis of the optical zone is decentered with respect to an optical axis of the eye.

A trial lens has a lens surface provided with an index. A stable position of the trial lens on a cornea is measured by the use of the index. The position of an optical center of a contact lens can be determined based on the measurement to set the position of the optical center of the contact lens so as to be matched with individual wearers.

Contact lenses, especially toric and bifocal, which are rotationally stabilized and methods of stabilizing contact lenses. Contact lenses are stabilized, with respect to rotation while in place on the eye, by providing the lenses with a non-circular shape. In a preferred embodiment, a toric contact lens is rotationally stabilized by providing the lens with an oval shape. Also disclosed are methods of providing non-circular lenses with appropriate shapes for proper fit to a patient's eye.

A presbyopia correction contact lens to be used in contact with a cornea of an eye of a wearer, the contact lens having a substantially circular central correction region (2, 24, 27) and an annular outer correction region (4, 25, 26) which surrounds the central correction region, the central and outer correction regions providing one and the other of a near vision correction region and a distance vision correction region, respectively, wherein the central correction region (2, 24, 27) has a center (P) which is offset by a distance of 0.2mm-2.4mm from a geometric center (O) of the contact lens toward a side portion of the lens which side portion is to be located on the side of the nose of the wearer when the contact lens is used in contact with the cornea, and the central correction region has a diameter within a range of 0.8mm-3.5mm.

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).