The human eye can see 500 shades of grey.

The human eye can see 500 shades of grey

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Your eyes are about 1 inch across and weigh about 0.25 ounce

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The average blink lasts for about 1/10th of a second

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Only one sixth of the human eyeball is exposed

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Eyes began to develop 550 million years ago. The simplest eyes were

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80% of vision problems worldwide are avoidable or even curable