An eye-strain reducing lens is characterized by an x-y-z coordinate system, and includes a distance-vision region, having a negative distance-vision optical power, configured to refract a light ray, directed by a source at a distance-vision region point at a distance-vision x-distance from a center of the coordinate system, to propagate to an eye-center-representative location; and a near-vision region, having a near-vision optical power that matches the distance-vision optical power within 0.5 D, configured to refract a light ray, directed by the source at a near-vision region point at a near-vision x-distance from the center of the coordinate system, to propagate to an x-z location of the eye-center representative location at a corresponding y height; wherein the near-vision x-distance is smaller than the distance-vision x-distance.

The current disclosure is directed to a method for determining an improved design for a progressive spectacle lens. Further, there are provided a method for manufacturing a progressive spectacle lens, a system for determining an improved design for a progressive spectacle lens, a non-transitory computer program and a progressive spectacle lens.

A progressive addition lens design method includes adjusting a lens surface shape to bring a difference between a first state when an object at a first location in a wearer's front and on the wearer's medial plane is visually recognized and a second state when an object at a second location positioned on the first location side in the horizontal direction at a constant height in the vertical direction is visually recognized in a plane parallel to a frontal plane and includes the first location at the time the lens is worn closer to a difference between a third state when an object at the first location is visually recognized and a fourth state when an object at the second location is visually recognized at the time a reference single focal lens corresponding to the progressive addition lens is worn or at the time equivalent to a naked eye.

A contact lens and a method for treating an eye with myopia is described. The contact lens includes an inner optic zone and an outer optic zone. The outer optic zone includes at least a portion with a first power, selected to correct distance vision. The inner optic zone has a relatively more positive power (an add power). In some embodiments the add power is substantially constant across the inner optic zone. In other embodiments the add power is variable across the inner optic zone. While in some embodiments the inner optic zone has a power designed to substantially eliminate lag of accommodation in the eye with myopia, in other embodiments, the add power may be higher.

A progressive ophthalmic spectacle lens (10) capable of correcting a wearer's ophthalmic vision and having a back surface (BS) and a front surface (FS), said lens comprising a light guide optical element arranged to output a supplementary image (SI) to the wearer through an exit surface (ES) of said light guide optical element, where the exit surface (ES), the back surface (BS) and an optical material located between said exit surface (ES) and said back surface (BS) form an optical device (OD) and wherein said optical device (OD) comprises an area of stabilized optical power.

Progressive power lens including: object side surface; eyeball side surface; and at least a near portion having a power for near vision, wherein object side surface includes power change in vertical direction of lens having progressive refractive power function, eyeball side surface includes power change in horizontal direction of lens having progressive refractive power function, when surface refractive power in the horizontal direction is defined as DHn and surface refractive power in vertical direction is defined as DVn in near power measurement point N in object side surface, relational expression of DHn<DVn is fulfilled, and near portion of eyeball side surface has a shaped part wherein signs of positive and negative of surface refractive power in vertical direction of lens and surface refractive power in horizontal direction of lens are opposite to each other.

A lens system may include overlapping lenses that shift laterally with respect to each other to provide vision correction. The lens system may include first and second lenses that include one or more freeform surfaces and one or more non-freeform surfaces. One or more of these lens surfaces may provide adjustable presbyopic vision correction and/or a static distance vision correction.

Eyeglass lenses having a plurality of image-generating cells have a lens body formed of an optically-transmissive material, the lens body having an arcuate convex first surface, the lens body having an arcuate concave second surface, a reflective layer embedded within the lens body between the first and second surfaces, the reflective layer having an array of facets, and each facet of the reflective layer having a planar surface. Each of the facets may be a polygon. The reflective layer may be optically transmissive. The lens body may have a forward portion between the first surface and the reflective layer. The forward portion may have a plurality of cells, each cell being coextensive with an associated facet, each cell having the form of a plano-convex lens and mirror assembly adapted to receive parallel incoming rays and to focus the rays at a focal point beyond the first surface of the lens.

An eyeglass lens design method includes: a prescription requirement-setting step in which prescription requirements for an eyeglass lens to be worn by an eyeglass wearer are set; a pattern setting step in which a plurality of patterns taking different values for at least one of; the prescription requirements for the eyeglass lens, a lens type, a progressive zone length, a wearing condition parameter pertaining to an eyeglass wearing condition in which the eyeglass wearer wears eyeglasses, a lifestyle/habit parameter pertaining to a lifestyle/habit of the eyeglass wearer and an optimization parameter used to control optimization of design for the eyeglass lens, are set; and a designing step in which eyeglass lens contours, each corresponding to one of the plurality of patterns having been set in the pattern setting step, are designed.

A computer implemented method of determining a base curve value representing a base curve for a front surface of a spectacle lens comprises the steps of receiving individual prescription data and determining the base curve value for the front surface of the spectacle lens based on the prescription data. The base curve value is calculated from the received prescription data based on a functional relationship between one or more values included in the prescription data and the base curve value.