Ophthalmic article
An ophthalmic article including at least one colored substrate, and a polarizer fixed to that at least one colored substrate, wherein the polarizer presents, on its own, a luminous transmittance according to ISO_13666, First edition, 1998 Aug. 1 of T v ≥41% and a polarization efficiency PE with 90%≥PE≥78%.
1 . An ophthalmic article, comprising:
at least one colored substrate; and
a polarizer fixed to the at least one colored substrate,
wherein the polarizer presents a luminous transmittance, according to ISO_13666, First edition, 1998 Aug. 1, T v ≥41% and a polarization efficiency 90%≥PE≥78%,
the polarizer has a transmission variation of less than 10% in a wavelength range between 430 nm and 630 nm,
the at least one colored substrate exhibits contrast enhancement properties, and
the ophthalmic article increases perceived separation of colors—variation of Chroma—present in a field of view of an article wearer with K up ≥13, in a contrast enhancement metric, with
Kup
=
100
*
1
6
∑
k
=
1
6
MAX
[
[
(
i
=
1
-
2
4
)
]
]
Δ
C
i
*
︷
6
where
[
[
(
MAX
[
[
(
i
=
1
-
24
)
]
]
Δ
C
i
*
)
]
︷
]
6
are six highest normalized delta Chroma ratios among 24 colors of a standard color palette.
2 . The ophthalmic article according to claim 1 , wherein the luminous transmittance, according to the ISO_13666, First edition, 1998 Aug. 1, of the polarizer is 41%≤T v ≤48%.
3 . The ophthalmic article according to claim 1 , wherein the polarizer has a polarization efficiency 80%≤PE≤85%.
4 . The ophthalmic article according to claim 1 , wherein the ophthalmic article has at least one functioning state in which a global luminous transmittance value of the ophthalmic article is smaller than 40%.
5 . The ophthalmic article according to claim 1 , wherein the at least one colored substrate is obtained by dip tinting of a contrast enhancement tint mixture.
6 . The ophthalmic article according to claim 1 , wherein the at least one colored substrate is obtained by bulk tinting of the substrate with a contrast enhancement tint mixture.
7 . The ophthalmic article according to claim 1 , wherein the at least one colored substrate is obtained by bulk tinting of the substrate with a photochromic mixture.
8 . The ophthalmic article according to claim 7 , wherein the ophthalmic article shows K up ≤10 in a deactivated state of the photochromic mixture and K up ≥13 in an activated state of the photochromic mixture.
9 . The ophthalmic article according to claim 7 , wherein the ophthalmic article is of category “1” in a deactivated state of the photochromic mixture and of category “3” in an activated state of the photochromic mixture.
10 . The ophthalmic article according to claim 7 , wherein the ophthalmic article is of category “2” in a deactivated state of the photochromic mixture, with a T v ≥25%, and of category “3” in an activated state of the photochromic mixture, with a T v ≤15%, and
the ophthalmic article further comprises fixed dyes, so as to have a K up ≥13 in the activated state.
11 . The ophthalmic article according to claim 1 , wherein the at least one colored substrate is obtained by application of a photochromic film laminate.
12 . Sunglasses comprising the ophthalmic article according to claim 1 .
13 . A method of forming the ophthalmic article, comprising:
fixing the at least one colored substrate to the polarizer, the polarizer and the at least one colored substrate being according to claim 1 .
14 . An ophthalmic article, comprising:
at least one colored substrate; and
a polarizer fixed to the at least one colored substrate,
wherein the polarizer presents a luminous transmittance, according to ISO_13666, First edition, 1998 Aug. 1, T v ≥41% and a polarization efficiency 90%≥PE≥78%, and
wherein the ophthalmic article is of category “2” in a deactivated state of a photochromic mixture, with a T v ≥25%, and of category “3” in an activated state of the photochromic mixture, with a T v ≤15%, and the ophthalmic article further comprises fixed dyes, so as to have a K up ≥13 in the activated state.