Patent ID: 8750969

Claim:
A wearable device for detection of auto fluorescence of an animal biological tissue, said animal biological tissue emitting a fluorescent component at a wavelength of about 515 nm when illuminated by a light source at a wavelength comprised between 200 and 1100 nm, said wavelength comprising at least one component at about 450 nm, said device comprising: a frame for glasses or a visor configured for optically positioning said wearable device for a user thereof; and an optical filter system having at least a pair of bandpass filters and a high-pass filter and isolating, in use, said fluorescent component and excluding components in visible and UV frequencies, said optical filter system being positioned in said frame for glasses or visor and comprising at least three superimposed nanometer-controlled lenses in optical glass, wherein, said optical filter system is configured for optically rendering said fluorescent component for said user and wherein said at least three superimposed lenses comprise: a first lens of said at least three lenses comprising a first bandpass filter of said pair of bandpass filters, said first bandpass filter having a transmittance curve showing a peak at about 500 nm and a band width comprised between about 300 and about 700 nm; a second lens of said at least three lenses superimposed in relation to said first lens and comprising a high-pass filter having a transmittance curve showing a plateau beyond about 540 nm; and a third lens of said at least three lenses superimposed in relation to at least said second lens and comprising a second bandpass filter of said pair of bandpass filters, said second bandpass filter having a transmittance curve showing a peak at about 465 nm and a band wideness comprised between about 300 and about 600 nm.