21st November 2019

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# How bad is a 20 40 Vision?

20/40 vision means that the test subject sees at 20 feet what a person with normal vision sees at 40 feet. Another way of saying this is that a person with 20/40 vision has vision that is only half as good as normal - or, objects must be at half the normal distance for him to see them.

Also, what does it mean to be 20 400?

Visual acuity is a number that indicates the sharpness or clarity of vision. A visual acuity measurement of 20/70 means that a person with 20/70 vision who is 20 feet from an eye chart sees what a person with unimpaired (or 20/20) vision can see from 70 feet away.

What does it mean when your vision is 20 150?

It depends on your context but generally yes. It means that what a normal person can see 150 feet away, the patient has to be within 20 feet away to see it. The next line on the chart is 20/200, which is legally blind in the U.S. assuming that the patient is wearing the best possible eyeglasses/contact lenses.