j_bertolotti
Today I learnt that the human eye has a horrible chromatic dispersion (i.e. blue and red light focus at very different places), equivalent to approximately 2 dioptres.
It is amazing we can see anything at all!
(The lesson here is that vision is a LOT more complex than we usually think.)
#TodayILearnt #Eyes #Optics
Jun 24 at 7:10amWeb
Show threadrndeon3d ago
@j_bertolotti having never heard this before, I had to go look up more. https://ia800108.us.archive.org/view_archive.php?archive=/24/items/wikipedia-scholarly-sources-corpus/10.1364%252FAO.1.000024.zip&file=10.1364%252FJOSAA.22.000029.pdf shows the money plot quickly, and it initially looks absurd: the y axis goes from -2 to +1! >1m difference in focal location! How could the brain possibly compensate for eyes this bad?
But phew the caption explains that the y axis is offset to 0. The text has actual values like 58+/-2, so the actual difference between red and blue focal distances is ~0.5mm. i think that means i can calm down, right?