Methods for designing an ophthalmic tinted lens and ophthalmic tinted lenses, and corresponding ophthalmic tinted lens
It is proposed a method for defining a design of an ophthalmic tinted lens provided with a turquoise blue ophthalmic filter. It is provided at least one optical parameter value that is prescribed with reference to a clear ophthalmic lens. At least one non-null optical power value is determined from said at least one prescribed optical parameter value. At least one reduction value is obtained. At least one reduced optical power value is calculated in function of said at least one non-null optical power value and said at least one reduction value. The ophthalmic tinted lens design is defined on the basis of said at least one reduced optical power value. Methods for defining a design of a first and a second ophthalmic tinted lens are also proposed. It is also proposed a corresponding ophthalmic tinted lens.
1 . A method for defining a design of an ophthalmic tinted lens provided with an ophthalmic filter having an average transmittance value over a range of wavelengths between 465-495 nm that is greater than a visual transmission value over a range of wavelengths 380-780 nm, said ophthalmic tinted lens being intended for an eye of a wearer, said method comprising:
obtaining at least one optical parameter value that is prescribed with reference to a clear ophthalmic lens;
determining at least one non-null optical power value from said at least one prescribed optical parameter value;
obtaining at least one reduction value, said at least one reduction value being between 0.125 and 0.75 diopter;
calculating at least one reduced optical power value in function of said at least one non-null optical power value and said at least one reduction value; and
defining the ophthalmic tinted lens design on the basis of said at least one reduced optical power value;
wherein the visual transmission value T V is computed using the following formula:
T
V
=
∫
780
nm
380
nm
E
s
(
λ
)
·
V
(
λ
)
·
T
(
λ
)
·
d
λ
∫
780
nm
380
nm
E
s
(
λ
)
·
V
(
λ
)
·
d
λ
where:
λ is a light wavelength within a visible range from 380 nm to 780 nm of a human vision;
T(λ) is a spectral transmittance value of the ophthalmic tinted lens at wavelength λ, expressed as a percentage value:
V(λ) is a value at wavelength λ of a spectral sensitivity profile V of a human eye for photopic vision; and
E s (λ) is a value at wavelength λ of a spectral intensity distribution Es of a solar light.
2 . The method according to claim 1 , wherein a ratio defined by the average transmittance value divided by the visual transmission value is superior to 1.5.
3 . The method according to claim 1 , wherein the average transmittance value is higher than 32%.
4 . The method according to claim 1 , wherein the visual transmission value is lower than 18%.
5 . The method according to claim 1 , wherein said reduction value is read in a table or calculated as a function of a highest determined non-null optical power value among said at least one non-null optical power value.
6 . The method according to claim 1 , wherein, the ophthalmic tinted lens being a single vision ophthalmic tinted lens, said at least one prescribed optical parameter value includes at least one of:
a prescribed sphere value, and
a prescribed cylinder value; and
said at least one determined non-null optical power value includes at least one of:
a determined non-null sphere value, and
a determined non-null sum of a sphere and of a cylinder value.
7 . The method according to claim 1 , wherein, the ophthalmic tinted lens being a progressive ophthalmic tinted lens, said at least one prescribed optical parameter value includes at least one of:
a prescribed sphere value for far vision,
a prescribed sphere value for near vision,
a prescribed cylinder value for far vision,
a prescribed cylinder value for near vision, and
a prescribed addition, and
said at least one determined non-null optical power value includes at least one of:
a determined non-null sphere value for far vision,
a determined non-null sphere value for near vision,
a determined non-null sum of a sphere value for far vision and of a cylinder value for far vision,
a determined non-null sum of a sphere value for near vision and of a cylinder value for near vision,
a determined non-null sum of a sphere value for far vision and of an addition,
a determined non-null sum of a sphere value for far vision and of an addition and of a cylinder value for far vision, and
a determined non-null sum of a sphere value for near vision and of an addition and of a cylinder value for near vision.
8 . The method according to claim 1 , wherein, in calculating said at least one reduced optical power value, the method further includes:
determining, in absolute terms, a highest optical power value among said at least one determined non-null optical power value; and
calculating said at least one reduced optical power value in function of said highest optical power value and said at least one reduction value.
9 . A method for producing an ophthalmic tinted lens, said method comprising:
defining a design of an ophthalmic tinted lens provided with an ophthalmic filter by executing the method of claim 1 ;
producing the ophthalmic tinted lens based on said defined ophthalmic tinted lens design and said ophthalmic filter.
10 . A method for defining a design of each of a first and a second ophthalmic tinted lenses, intended for a first and a second eye of an identified wearer, each of said first and second ophthalmic tinted lenses being provided with an ophthalmic filter having an average transmittance value over a range of wavelengths between 465-495 nm that is greater than a visual transmission value over a range of wavelengths 380-780 nm, the method comprising, for each of said first and a second ophthalmic tinted lenses:
obtaining at least one optical parameter value that is prescribed with reference to a clear ophthalmic lens;
determining at least one non-null optical power value from said at least one prescribed optical parameter value; and
determining, in absolute terms, a highest optical power value among the at least one non-null optical power value determined for both the first and the second ophthalmic tinted lenses;
obtaining at least one reduction value, said at least one reduction value being between 0.125 and 0.75 diopter;
for a main lens being one of said first and a second ophthalmic tinted lenses to which is attached said highest optical power value, calculating at least one reduced optical power value in function of said highest optical power value and said at least one reduction value;
for an auxiliary lens being the other one of said first and a second ophthalmic tinted lenses, calculating, at least one another reduced optical power value in function of:
a non-null optical power value of at least one optical power of said auxiliary lens, said at least one optical power corresponding to the at least one optical power of the main lens whose non-null optical power value is, in absolute terms, said highest optical power value, and
said at least one reduction value; and
defining a design for said main lens on the basis of said at least one reduced optical power value and defining a design for said auxiliary lens on the basis of said at least one another reduced optical power value;
wherein the visual transmission value T V is computed using the following formula:
T
V
=
∫
780
nm
380
nm
E
s
(
λ
)
·
V
(
λ
)
·
T
(
λ
)
·
d
λ
∫
780
nm
380
nm
E
s
(
λ
)
·
V
(
λ
)
·
d
λ
where:
λ is a light wavelength within a visible range from 380 nm to 780 nm of a human vision;
T(λ) is a spectral transmittance value of the ophthalmic tinted lens at wavelength λ expressed as a percentage value:
V(λ) is a value at wavelength λ of a spectral sensitivity profile V of a human eye for photopic vision; and
E s (λ) is a value at wavelength λ of a spectral intensity distribution Es of a solar light.
11 . A method for defining a design of each of a first and a second ophthalmic tinted lenses, intended for a first and a second eye of an identified wearer, each of said first and second ophthalmic tinted lenses being provided with an ophthalmic filter having an average transmittance value over a range of wavelengths between 465-495 nm that is greater than a visual transmission value over a range of wavelengths 380-780 nm, said first eye being a dominant eye, the method comprising, for each of said first and a second ophthalmic tinted lenses:
obtaining at least one optical parameter value that is prescribed with reference to a clear ophthalmic lens;
determining at least one non-null optical power value from said at least one prescribed optical parameter value;
for the first ophthalmic tinted lens intended to the dominant eye, determining, in absolute terms, a highest optical power value among the at least one non-null optical power value determined for said first ophthalmic tinted lens intended to the dominant eye;
obtaining at least one reduction value, said at least one reduction value being between 0.125 and 0.75 diopter;
for the first ophthalmic tinted lens intended to the dominant eye, to which is attached said highest optical power value, calculating at least one reduced optical power value in function of said highest optical power value and said at least one reduction value;
for the second ophthalmic tinted lens, calculating at least one another reduced optical power value in function of:
a non-null optical power value of at least one optical power of said second ophthalmic tinted lens, said at least one optical power corresponding to the at least one optical power of the first ophthalmic tinted lens whose non-null optical power value is, in absolute terms, said highest optical power value, and
said at least one reduction value; and
defining a design for said first ophthalmic tinted lens on the basis of said at least one reduced optical power value; and defining a design for said second ophthalmic tinted lens on the basis of said at least one another reduced optical power value;
wherein the visual transmission value T V is computed using the following formula:
T
V
=
∫
780
nm
380
nm
E
s
(
λ
)
·
V
(
λ
)
·
T
(
λ
)
·
d
λ
∫
780
nm
380
nm
E
s
(
λ
)
·
V
(
λ
)
·
d
λ
where:
Δ is a light wavelength within a visible range from 380 nm to 780 nm of a human vision;
T(λ) is a spectral transmittance value of the ophthalmic tinted lens at wavelength λ expressed as a percentage value:
V(λ) is a value at wavelength λ of a spectral sensitivity profile V of a human eye for photopic vision; and
E s (λ) is a value at wavelength λ of a spectral intensity distribution Es of a solar light.
12 . The method of defining a design of each of a first and a second ophthalmic tinted lenses according to claim 8 , intended for a first and a second eye of an identified wearer, wherein the ophthalmic filter of said first and second ophthalmic tinted lenses are substantially identical.
13 . A method for producing a first and a second ophthalmic tinted lenses, said method comprising:
defining designs for said first ophthalmic tinted lens and said second ophthalmic tinted lens, by executing the method of claim 10 ;
producing the first ophthalmic tinted lens and the second ophthalmic tinted lens based on said defined designs and based on said ophthalmic filter provided for each of the first ophthalmic tinted lens and the second ophthalmic tinted lens.
14 . A non-transitory computer readable medium including a computer program product comprising one or more stored sequences of instructions that are accessible to a processor and which, when executed by the processor, causes the processor to carry out the method according to claim 1 .
15 . An assembly comprising:
a document on which is provided at least one optical parameter value that is prescribed with reference to a clear ophthalmic lens; and
an ophthalmic tinted lens provided with an ophthalmic filter having an average transmittance value over a range of wavelengths between 465-495 nm that is greater than a visual transmission value over a range of wavelengths 380-780 nm,
wherein, the ophthalmic tinted lens being associated with said at least one prescribed optical parameter value, the ophthalmic tinted lens has at least one optical power value measured on said ophthalmic tinted lens that differs from a corresponding optical power value determined from said at least one prescribed optical parameter value, the difference between said corresponding optical power value determined from said at least one prescribed optical parameter value and said at least one optical power value measured on said ophthalmic tinted lens, referred to as a reduction value, being between 0.125 and 0.75 diopter;
wherein the visual transmission value T V is computed using the following formula:
T
V
=
∫
780
nm
380
nm
E
s
(
λ
)
·
V
(
λ
)
·
T
(
λ
)
·
d
λ
∫
780
nm
380
nm
E
s
(
λ
)
·
V
(
λ
)
·
d
λ
where:
λ is a light wavelength within a visible range from 380 nm to 780 nm of a human vision;
T(Δ) is a spectral transmittance value of the ophthalmic tinted lens at wavelength λ expressed as a percentage value;
V(λ) is a value at wavelength λ of a spectral sensitivity profile V of a human eye for photopic vision; and
E s (λ) is a value at wavelength λ of a spectral intensity distribution Es of a solar light.
16 . The assembly of claim 15 , wherein the document is a paper.