Patent ID: 7217913

Claim:
A detector for detecting light reflected off at least one eye of a subject comprising: a hybrid filter comprised of a first filter layer and a patterned filter layer below the first filter layer, wherein the first filter layer passes light reflected off the at least one eye of the subject at or near a first wavelength and at or near a second wavelength and blocks light at all other wavelengths and the patterned filter layer includes regions that transmit light received at or near the first wavelength and block light received at or near the second wavelength and regions that transmit light received at or near the second wavelength and block light received at or near the first wavelength, and wherein the patterned filter layer comprises one of patterned dye-doped polymers, patterned pigment-doped polymers, patterned reflective filters, or patterned absorbing filters; and a light-detecting sensor underneath the hybrid filter and detecting the amount of light received at or near the first wavelength and the amount of light received at or near the second wavelength.