The Normal EYE

• What is “20/20 Vision” ?

  • Being able to, at a distance of 20 feet, read a character, eg the letter E, which is meant to be read at a distance of 20 feet.
  • The size of the letter E for example which can be read by the eye with 20/20 vision is :

• 20/15 vision is better than 20/30 vision.

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