Method for designing spectacle lens, method for manufacturing spectacle lens, and system for designing spectacle lens
Provided is a technology that makes a change in the amount of aberration that is a combination of aberration in an eye and aberration in a spectacle lens robust with respect to rotation. Provided are a method for designing a spectacle lens and related technologies in which, when rotational asymmetry of an aberration distribution of an eye of a wearer about an optical axis is strong, a spectacle lens that has an aberration distribution of which rotational asymmetry is weak in a region having a predetermined width and a center at any point on a main meridian of the spectacle lens is obtained as a design solution, and when rotational asymmetry of the aberration distribution of the eye of the wearer about the optical axis is weak, a spectacle lens of which rotational asymmetry is strong in the region is obtained as a design solution.
1 . A method for manufacturing a spectacle lens, wherein
an index that is obtained by quantifying rotational asymmetry regarding the aberration distribution of an eye of a wearer about an optical axis is represented by Ei,
a standard value of Ei is represented by Es, and
an index that is obtained by quantifying rotational asymmetry of an aberration distribution in a region (i) having a predetermined width and (ii) a center at any point on a main meridian of a spectacle lens is represented by Li,
the method comprising:
performing, by a computer,
obtaining, as a design solution, a spectacle lens of which Li is a first amount when Ei is larger than Es, and
obtaining, as a design solution, a spectacle lens of which Li is a second amount when Ei is not larger than Es, the first amount being lower than the second amount; and
manufacturing a spectacle lens having an aberration distribution of which rotational asymmetry is the first amount or the second amount.
2 . The method for manufacturing a spectacle lens according to claim 1 ,
wherein obtaining the spectacle lens as a design solution includes selecting a design solution from a plurality of design solutions that have different values of Li.
3 . The method for manufacturing a spectacle lens according to claim 1 ,
wherein the rotational asymmetry of the aberration distribution of the eye is of a portion of a cornea corresponding to a pupil of the eye of the wearer, about the optical axis.
4 . The method for manufacturing a spectacle lens according to claim 3 ,
wherein Ei is expressed by the following Expression 1, and
∑
m
,
n
mE
m
,
n
Expression
1
Li is expressed by the following Expression 2,
∑
m
,
n
mL
m
,
n
Expression
2
wherein E and L respectively represent polar coordinate expressions of Zernike aberration coefficients of the eye of the wearer and the spectacle lens, m represents a value indicating an order in a circumferential direction, and n represents a value indicating an order in a radial direction.
5 . The method manufacturing a spectacle lens according to claim 1 ,
wherein Ei is determined based on at least one of a degree of turning of the eye of the wearer, a degree of a change in a pupil diameter of the wearer, the age of the wearer, an environment in which the wearer uses spectacles or an intended use of the spectacles for the wearer, and a time elapsed from the last visit of the wearer to an optician's store.
6 . The method for manufacturing a spectacle lens according to claim 1 ,
wherein Es is determined based on at least one of a standard or average aberration that is obtained statistically or academically with respect to an eye of a spectacle wearer, a degree of turning of the eye of the wearer, a degree of a change in a pupil diameter of the wearer, the age of the wearer, an environment in which the wearer uses spectacles or an intended use of the spectacles for the wearer, and a time elapsed from the last visit of the wearer to an optician's store.
7 . The method for manufacturing a spectacle lens according to claim 1 ,
wherein a spectacle lens is obtained as a design solution according to a difference between Ei and Es.
8 . The method for manufacturing a spectacle lens according to claim 1 ,
wherein the spectacle lens is a progressive refractive power lens.
9 . A system for manufacturing a spectacle lens, wherein
an index that is obtained by quantifying rotational asymmetry regarding the aberration distribution of an eye of a wearer about an optical axis is represented by Ei,
a standard value of Ei is represented by Es, and
an index that is obtained by quantifying rotational asymmetry of an aberration distribution in a region (i) having a predetermined width and (ii) a center at any point on a main meridian of a spectacle lens is represented by Li,
the system comprising:
a computer configured to:
obtain, as a design solution, a spectacle lens of which Li is a first amount when Ei is larger than Es; and
obtain, as a design solution, a spectacle lens of which Li is a second amount when Ei is not larger than Es, the first amount being lower than the second amount, wherein
the system is configured to manufacture a spectacle lens having an aberration distribution of which rotational asymmetry is the first amount or the second amount.
10 . The system for manufacturing a spectacle lens according to claim 9 ,
wherein obtaining the spectacle lens as a design solution includes selecting a design solution from a plurality of design solutions that have different values of Li.
11 . The system for manufacturing a spectacle lens according to claim 9 ,
wherein the rotational asymmetry of the aberration distribution of the eye is of a portion of a cornea corresponding to a pupil of the eye of the wearer, about the optical axis.
12 . The system for manufacturing a spectacle lens according to claim 11 ,
wherein Ei is expressed by the following Expression 1, and
∑
m
,
n
mE
m
,
n
Expression
1
Li is expressed by the following Expression 2,
∑
m
,
n
mL
m
,
n
Expression
2
wherein E and L respectively represent polar coordinate expressions of Zernike aberration coefficients of the eye of the wearer and the spectacle lens, m represents a value indicating an order in a circumferential direction, and n represents a value indicating an order in a radial direction.
13 . The system for manufacturing a spectacle lens according to claim 11 ,
wherein Ei is determined based on at least one of a degree of turning of the eye of the wearer, a degree of a change in a pupil diameter of the wearer, the age of the wearer, an environment in which the wearer uses spectacles or an intended use of the spectacles for the wearer, and a time elapsed from the last visit of the wearer to an optician's store.
14 . The system for manufacturing a spectacle lens according to claim 9 ,
wherein Es is determined based on at least one of a standard or average aberration that is obtained statistically or academically with respect to an eye of a spectacle wearer, a degree of turning of the eye of the wearer, a degree of a change in a pupil diameter of the wearer, the age of the wearer, an environment in which the wearer uses spectacles or an intended use of the spectacles for the wearer, and a time elapsed from the last visit of the wearer to an optician's store.
15 . The system for manufacturing a spectacle lens according to claim 9 ,
wherein a spectacle lens is obtained as a design solution according to a difference between Ei and Es.
16 . The system for manufacturing a spectacle lens according to claim 9 ,
wherein the spectacle lens is a progressive refractive power lens.