Next time you get your vision checked, the eye doctor may be taking a look at your brain! The retina in the back of your eyes holds blood vessels that are a good indicator of overall blood vessel health inside your brain. In a recent study of women over 65, participants who had retinal vessel trouble also showed more brain vessel damage. They also scored about 15% lower in tests...
While human eyes can see many colors, the greeneye fish—found at ocean depths between 160 to 3,300 feet—can really only detect a green color, meaning any non-green predators should have an advantage over this tiny fish. Yet scientists at Duke University discovered that these greeneye fish have color-changing lenses in their eyes, which pick up ultraviolet light and transmit it as a green color back to the...
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