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How can the human eye be tricked into keeping the lens relaxed?

To form a clear image, light must be focused on the retina, which detects the light and sends signals through the optic nerve to the visual centre of the brain. To achieve the focusing, most ...
Chris's user avatar
  • 3,414
1 vote

Evidence to support 20-20-20 rule?

6 m/20 feet is about the infinity distance for the human eye - actual infinity is infinity, but the accommodation between 6 m and infinity is minimal. this is known as the Far Point. The actual best ...
bob1's user avatar
  • 3,501

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