Today I learned_ the lens in the human_

Today I learned: the lens in the human eye doesn't just work by being a c...
Tim HuttonTim Hutton - 2015-09-18 12:18:51+0000 - Updated: 2015-09-18 12:18:51+0000
Today I learned: the lens in the human eye doesn't just work by being a curved shape, it also has a variable index of refraction - the material is more refractive in the center and less refractive on the edge. This amplifies the lens effect.

Gradient-index optics - Wikipedia, the free encyclopedia

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Allen Knutson - 2015-09-19 11:14:11+0000
It's certainly got plenty of chromatic aberration, as is clear to anyone who's tried to focus on a blue neon sign at night, or looked at clouds through blue-blocker sunglasses by day.

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