what does 20/40 mean in vision
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what does 20/40 mean in vision
what does 20/400 mean in vision
what does 20/40 vision mean in prescription
2. what does it mean to have 20 / 40 vision
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what does 20 40 vision mean in both eyes
what does it mean to have 20 / 40 vision
what does 20/40 eyesight mean
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what does 20/40 mean in vision, what does 20/400 mean in vision, what does 20/40 vision mean in prescription, 2. what does it mean to have 20 / 40 vision, what does 20/40 vision mean in one eye, what does 20 40 vision mean in both eyes, what does it mean to have 20 / 40 vision, what does 20/40 eyesight mean, what is 40 20 vision, what is 20-40 vision, eyesight 20 40 means