Optical filter comprising a variable transmittance layer

An optical filter comprising:

• a variable transmittance layer having a first spectrum in a dark state and a second spectrum in a faded state, wherein a light transmission value of the variable transmittance layer in the dark state is lower than a light transmission value of the variable transmittance layer in the faded state, and wherein each of the first and second spectra comprise a visible portion;
• and
• an ultraviolet (UV) blocking layer that has a cutoff wavelength of between 370 nm and 435 nm, wherein the variable transmittance layer and the UV blocking layer comprise a stack,
• wherein the optical filter comprises a light transmission value of 1% or less in the dark state and 6% or higher in the faded state.

An optical filter comprising:

• a variable transmittance layer having a first spectrum in a dark state and a second spectrum in a faded state, wherein a light transmission value of the variable transmittance layer in the dark state is lower than a light transmission value of the variable transmittance layer in the faded state, and wherein each of the first and second spectra comprise a visible portion;
• and
• an ultraviolet (UV) blocking layer that has a cutoff wavelength of between 370 nm and 435 nm, wherein the variable transmittance layer and the UV blocking layer comprise a stack,
• wherein the optical filter comprises a light transmission value of 5% or less in the dark state and 15% or higher in the faded state.