How many letters can you miss on an eye chart?

20/40 (6/12) indicates that the line you correctly read at 20 feet (6 meters) away can be read by a person with normal vision from 40 feet (12 meters) away. Even if you miss one or two letters on the smallest line you can read, you are still considered to have vision equal to that line.

What line should you be able to read on an eye chart?

A 3- to 4-year-old should be able to read the 20/40 line, and a 5-year-old the 20/30 line. Older children and adults should be able to read the majority of letters on the 20/20 line.

What line is 20 50 on the eye chart?

The second line is 20/50. Best corrected acuity in the range between 20/50 and 20/100 is considered disabling in occupations which require work with numbers or extensive reading. The third line is equivalent to 20/40, it is the driver’s test line.

How far away from an eye chart do you stand?

The chart is attached to a wall at eye level. Stand 10 feet (3 meters) away from the chart. If you wear glasses or contact lenses for distance vision, wear them for the test.

What visual acuity needs glasses?

If you have 20/40 vision, for example, that means you need to be 20 feet away to see an object that people can normally see from 40 feet away. If your visual acuity is not 20/20, you may need corrective eyeglasses, contact lenses, or surgery.

What letters are not used on an eye chart?

Even the types of letters used are carefully chosen. The next time you are looking at an eye chart, you will notice that it does not contain every letter of the alphabet. The only letters used are C, D, E, F, L, N, O, P, T and Z.

How can I tell if I have 20 40 vision?

If you have 20/40 vision, it means that when you stand 20 feet away from the chart you can only see what a normal human can see when standing 40 feet from the chart….DMV’s Vision Screening Standards are:

• 20/40 with both eyes tested together and.
• 20/40 in one eye and.
• 20/70, at least in the other eye.

What do the numbers on a 20/20 vision chart mean?

The top number refers to the distance in feet that you stand from the chart. The bottom number indicates the distance at which a person with normal eyesight can read the same line you correctly read. A person with 20/20 vision can see what an average person can see on an eye chart when they are standing 20 feet away.

How far can you see with 20 10 vision?

If you have 20/10 vision, you can see at 20 feet, what a normal person can see at 10 feet from an eye chart.

How far away from the eye chart can you see?

To clarify this further, if you have 20/40 vision, and there is a normal person standing 40 feet from the chart and you are standing 20 feet from the chart, you both see the same amount of detail on the eye chart. The reverse applies if you have 20/10 vision.

What do the numbers at the bottom of an eye chart mean?

The bottom number indicates the distance at which a person with normal eyesight can read the same line you correctly read. A person with 20/20 vision can see what an average person can see on an eye chart when they are standing 20 feet away.