Lens

A lens comprising at least two regions, a first region being configured to pass incident light having a wavelength falling within a first band, and a second region being configured to pass incident light having a wavelength falling within a second band that is different from the first band.

A lens comprising a first approximately central disc-shaped region that is spectrally selective only for light of wavelengths where L and M cones of a human eye have good spectral responsivity, and a second approximately annular region extending outwardly from the first region that is spectrally selective only for light of wavelengths where S cones of a human eye have good spectral responsivity.

A lens comprising a first approximately central disc-shaped region that is spectrally selective for light of wavelengths where L and M cones of a human eye have good spectral responsivity, and a second approximately annular region extending outwardly from the first region that is spectrally selective for light of wavelengths where S cones of a human eye have good spectral responsivity, wherein:

• the first region is configured to have a transmittance that increases from about 0.5 at 490 nm to approaching 1 at higher wavelengths to thereby pass light of wavelengths above about 490 nm, and
• the second region is configured to have a transmittance that increases from approximately zero below 370 nm, to about 0.5 at 400 nm, to approaching 1 between about 420 nm and 450 nm, and reduces to about 0.5 at roughly 480 nm to thereby pass light having a wavelength between about 370 to 480 nm.