US 12,681,334 B2Granted

Ophthalmic article

AssigneeBarberini S.P.A.

InventorsMatteo Lagasi, Natalia Schianchi, Didier Clerc

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Abstract

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 Tv≥41% and a polarization efficiency PE with 90%≥PE≥78%.

Claims14

Dependent claims

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, Tv≥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 Kup≥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.

66 more elements

Dependencies are inferred from the claim text.

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Abstract