WillTFB t1_j7m36pp wrote on February 7, 2023 at 8:02 PM

Reply to comment by TrumpterOFyvie in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23

Wonder what the science behind this is

planoavid t1_j7m6nu8 wrote on February 7, 2023 at 8:24 PM

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.

WillTFB t1_j7m8r6y wrote on February 7, 2023 at 8:38 PM

Ah thank you, that make sense.

ozyx7 t1_j7oeneq wrote on February 8, 2023 at 6:33 AM

Eyes evolved to be most receptive to things of interest.

Things in nature that are green are very interesting. For example, plants. It's probably important to be able to focus on those, especially if you're arboreal.

Things in nature that are yellow or red are also interesting. For example, fruits, blood, and poisonous things.

Things in nature that are blue are much less common. By far, the most prevalent blue thing we encounter is the sky, and that isn't something that we need to focus on.

AtraposJM t1_j7xrlta wrote on February 10, 2023 at 3:46 AM

Not sure this is true but I have a degree in graphic design and I had a teacher tell me that men see yellows and greens a little bit better than women do because when hunting they'd have to see movement in grass etc. Was told to be aware of over correcting for yellows and greens when colour correcting photos and things.