Eyeglass lens and design method for eyeglass lens
AssigneeHoyo Lens Thailand Ltd.
InventorShohei MATSUOKA
Life of this patent
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Abstract
An eyeglass lens including a base region that causes light incident on an object-side surface to exit from an eye-side surface, enter an eye, and converge at a predetermined position A on a retina, and a plurality of defocus regions having a characteristic of causing light to converge at a position B farther from an object side than the position A is. Also, d1/d2 is greater than 2 and less than 3, where d1, which is the diameter of a circle circumscribing a triangle connecting centers of three of the defocus regions closest to each other, is divided by d2, which is the diameter of the defocus regions.
Claims7
An eyeglass lens comprising:
- a base region configured to cause light incident on an object-side surface to exit from an eye-side surface, enter an eye, and converge at a predetermined position A on a retina;
- and
- a plurality of defocus regions having a characteristic of causing light to converge at a position B farther from an object side than the position A is,
- wherein d1/d2 is greater than 2 and less than 3, where d1, which is the diameter of a circle circumscribing a triangle connecting centers of three of the defocus regions closest to each other, is divided by d2, which is the diameter of the defocus regions.
A design method for an eyeglass lens, comprising the steps of:
- designing a base region configured to cause light incident on an object-side surface to exit from an eye-side surface, enter an eye, and converge at a predetermined position A on a retina;
- and
- designing a plurality of defocus regions having a characteristic of causing light to converge at a position B farther from an object side than the position A is,
- wherein in the step of designing the plurality of defocus regions, the plurality of defocus regions are designed in such a manner that d1/d2 is greater than 2 and less than 3, where d1, which is the diameter of a circle circumscribing a triangle connecting centers of three of the defocus regions closest to each other, is divided by d2, which is the diameter of the defocus regions.
Dependencies are inferred from the claim text.