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Our eyesight is sharpest at twilight – and now we may know why

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OUR sight is sharpest at dawn and dusk – and now we may know why. It is not a result of changes within our eyes, but of how the brain processes visual signals.

The brain has continual background activity. But this lessens in the visual centres around sunrise and sunset, which may improve our perception of visual information in the low light levels at these times.

“You are sensitising your brain,” says Christian Kell of Goethe University in Germany. “A weak signal coming in will have a higher signal-to-noise ratio.”

Our eyes adapt to …

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