<P> Humans normally have three types of cones . The first responds the most to light of long wavelengths , peaking at about 560 nm ; this type is sometimes designated L for long . The second type responds the most to light of medium - wavelength , peaking at 530 nm , and is abbreviated M for medium . The third type responds the most to short - wavelength light , peaking at 420 nm , and is designated S for short . The three types have peak wavelengths near 564 -- 580 nm , 534 -- 545 nm , and 420 -- 440 nm , respectively , depending on the individual . </P>
<P> Humans normally have three types of cones . The first responds the most to light of long wavelengths , peaking at about 560 nm ; this type is sometimes designated L for long . The second type responds the most to light of medium - wavelength , peaking at 530 nm , and is abbreviated M for medium . The third type responds the most to short - wavelength light , peaking at 420 nm , and is designated S for short . The three types have peak wavelengths near 564 -- 580 nm , 534 -- 545 nm , and 420 -- 440 nm , respectively , depending on the individual . </P>
three types of cones that enable color vision
three types of cones that enable color vision
L M S
L M S