Design method for eyeglass lens, production method for eyeglass lens, eyeglass lens, and eyeglasses

Patent metadata

Field	Value
Publication number	US-2025180926-A1
Application number	US-202318862040-A
Country	US
Kind code	A1
Filing date	Jul 19, 2023
Priority date	Jul 19, 2022
Publication date	Jun 5, 2025
Grant date	—

Abstract

There are provided a method for designing a spectacle lens and a related technique thereof, the method including: a modeling step of dividing a pattern into multiple models with a deviation from a normally worn state of the spectacle lens as decentering, in which a reference model, a decenter model, and a tilt model are prepared as the multiple model; a sensitivity calculation step of calculating a decenter sensitivity and a tilt sensitivity; and a design step of using a base curve value in the vicinity of a balance solution as a base curve of the spectacle lens, wherein a base curve value c [unit: diopter (D)] which is a curvature of a surface in a region H where the on-retinal non-convergence region is not provided on an object-side surface is taken as x-axis, and the decenter sensitivity and the tilt sensitivity [unit: diopter (D)] are taken as y-axis, and an intersection of a plot of the decenter sensitivity and a plot of the tilt sensitivity is taken as the balance solution.

First claim

1 . A method for designing a spectacle lens that has an effect of inhibiting a progression of myopia or reducing hyperopia, the spectacle lens including: a central clear region that is a region including an eye point, which causes a light beam entering from an object-side surface to exit from an eyeball-side surface, enter a wearer's pupil, and converge on a retina to achieve a prescribed refractive power; and an annular functional region surrounding the central clear region, the functional region including: a base region that allows the light beam entering from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina to achieve the prescribed refractive power; and an on-retinal non-convergence region that allows the light beam entering from the object-side surface to exit from the eyeball-side surface, while not allowing the light beam that enters the wearer's pupil to converge on the retina,
the method including: a modeling step of dividing a pattern into multiple models with a deviation from a normally worn state of the spectacle lens as decentering, to prepare the following models as the multiple models: a reference model that represents a pupil center and a rotation center when observing an object through a central clear region; a decenter model in which the rotation center and the pupil center of the reference model are translated by the same distance horizontally; and a tilt model in which only the rotation center moves horizontally from a reference state by the same amount as a translation amount in the decenter model, and the pupil center does not move from a straight line passing through the rotation center and the pupil center of the reference model; a sensitivity calculation step of calculating a decenter sensitivity and a tilt sensitivity, wherein a common object surface is set for each model, and a central light beam is set, which is a light beam emitted from a point on the object surface and passing through the pupil center and the rotation center of each of the models, and a difference between an astigmatism of the central light beam in the decenter model and an astigmatism of the central light beam in the reference model is defined as the decenter sensitivity, and a difference between an astigmatism of the central light beam in the tilt model and an astigmatism of the central light beam in the reference model is defined as the tilt sensitivity; and a design step of using a base curve value in the vicinity of a balance solution as a base curve of the spectacle lens, wherein a base curve value c [unit: diopter (D)] which is a curvature of a surface in a region H where the on-retinal non-convergence region is not provided on an object-side surface is taken as x-axis, and the decenter sensitivity and the tilt sensitivity [unit: diopter (D)] are taken as y-axis, and an intersection of a plot of the decenter sensitivity and a plot of the tilt sensitivity is taken as the balance solution.

2 . The method for designing a spectacle lens according to claim 1 , wherein the base curve of the spectacle lens used in the design step falls within a range with an upper limit being (+0.25 D when y-axis value in the plot of the tilt model is zero) and a lower limit being a value determined so that the base curve value of the balance solution is an intermediate value.

3 . The method for designing a spectacle lens according to claim 2 ,
wherein the design step includes an aspheric correction step of: performing aspheric correction to at least one of the region H on the object-side surface of the spectacle lens and the region H′ on the eyeball-side surface where the on-retinal non-convergence region is not provided; and moving an intersection of the plots in y-axis direction to bring a value of a generation amount of astigmatism in the balance solution closer to zero.

4 . The method for designing a spectacle lens according to claim 2 , the method including:
a base curve determination step of determining a base curve value of the spectacle lens in advance before the design step, wherein the design step includes an aspheric correction step of performing aspheric correction to at least one of the region H on the object-side surface of the spectacle lens and the region H′ on the eyeball-side surface where the on-retinal non-convergence region is not provided; and moving an intersection of the plots in an x-axis direction to bring a base curve value in the balance solution closer to a base curve value determined in the base curve determination step.

5 . The method for designing a spectacle lens according to claim 2 , the method including:
a base curve determination step of determining a base curve value of the spectacle lens in advance, before the design step, wherein the design step includes: an aspheric correction step of performing aspheric correction to at least one of the region H on the object-side surface of the spectacle lens and the region H′ on the eyeball-side surface where the on-retinal non-convergence region is not provided; and moving an intersection of the plots in an x-axis direction to bring the base curve value in the balance solution closer to the base curve value determined in the base curve determination step, and moving the intersection of the plots in a y-axis direction to bring a value of a generation amount of astigmatism in the balance solution closer to zero.

6 . The method for designing a spectacle lens according to any one of claims 3 to 5 , wherein the aspheric surface correction step is performed by adding a sag amount including a fourth-order function component to at least one of the region H and the region H′.

7 . The method for designing a spectacle lens according to claim 6 , wherein in the aspheric correction step, aspheric correction is performed to the region H′ on the eyeball-side surface of the spectacle lens.

8 . The method for designing a spectacle lens according to claim 1 , wherein the object-side surface is a spherical surface centered on a rotation center of the reference model.

9 . A method for producing a spectacle lens having an effect of inhibiting a progression of myopia or reducing hyperopia, the spectacle lens including: a central clear region that is a region including an eye point, which causes a light beam entering from an object-side surface to exit from an eyeball-side surface, enter a wearer's pupil, and converge on a retina to achieve a prescribed refractive power; an annular functional region surrounding the central clear region, the functional region including: a base region that allows the light beam entering from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina to achieve the prescribed refractive power; and an on-retinal non-convergence region that allows the light beam entering from the object-side surface to exit from the eyeball-side surface, while not allowing the light beam to enter the wearer's pupil to converge on the retina,
the method including: a modeling step of dividing a pattern into multiple models with a deviation from a normally worn state of the spectacle lens as decentering, to prepare the following models as the multiple models: a reference model that represents a pupil center and a rotation center when observing an object through a central clear region, a decenter model in which the rotation center and the pupil center of the reference model are translated by the same distance horizontally, and a tilt model in which only the rotation center moves horizontally from a reference state by the same amount as a translation amount in the decenter model, and the pupil center does not move from a straight line passing through the rota

Assignees

• Hoya Lens Thailand Ltd

Inventors

• Matsuoka Shohei
• TATEJIMA Seitaro

Classifications

• G02C2202/24

  Myopia progression prevention · CPC title

• G02C7/028

  Special mathematical design techniques · CPC title

• G02C7/027

  considering wearer's parameters · CPC title

• G02C7/022 Primary

  Ophthalmic lenses having special refractive features achieved by special materials or material structures (G02C7/049 takes precedence) · CPC title

• G02C7/02

  Lenses; Lens systems {; Methods of designing lenses} · CPC title