planoavid t1_j7m6nu8 wrote on February 7, 2023 at 8:24 PM Reply to comment by WillTFB in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23 The lens and cornea of the human eye absorbs shorter wavelengths (blue) better than longer wavelengths (red) so less blue lights reach the retina. The cones the retina uses to see longer wavelengths are active over a wider array of wavelengths vs the blue cone. So it is easier for your eye to sense longer wavelengths of light than the blue light. Permalink Parent 17
planoavid t1_j7m6nu8 wrote
Reply to comment by WillTFB in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
The lens and cornea of the human eye absorbs shorter wavelengths (blue) better than longer wavelengths (red) so less blue lights reach the retina.
The cones the retina uses to see longer wavelengths are active over a wider array of wavelengths vs the blue cone.
So it is easier for your eye to sense longer wavelengths of light than the blue light.