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2021-01-23
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How do you read eye chart results?
To interpret your reading, think of the numbers in feet. For instance, someone with 20/60 vision can read at 20 feet away what a person with normal vision could read at 60 feet away. Modern optometry exam rooms are equipped with electronic eye reading charts, making it easier to produce accurate readings.
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. If you notice any results that fall outside these standards, be sure to schedule an eye exam with your Vision Source doctor.
What line on an eye chart is 20 40?
If this is the smallest line a person can read, the person's acuity is “6/12” (“20/40”), meaning that this person needs to approach to a distance of 6 meters (20 ft) to read letters that a person with normal acuity could read at 12 meters (39 ft).
How do you read a Snellen eye chart?
To interpret your reading, think of the numbers in feet. For instance, someone with 20/60 vision can read at 20 feet away what a person with normal vision could read at 60 feet away. Modern optometry exam rooms are equipped with electronic eye reading charts, making it easier to produce accurate readings.
What is the bottom line of an eye chart?
The bottom number indicates the distance at which a person with normal eyesight can read the same line. As an example, if the fifth row on the Snellen chart were the smallest row you could read, you would have 20/40 vision.
What size are the letters on an eye chart?
Using a Snellen Eye Chart So if, at 20 feet, you can read the letters on the row marked 40, this means you have visual acuity of 20/40 or better: 1/2 normal. From 10 feet, if the smallest letters you could read were on the 40 line, this would give you an acuity of 10/40: 1/4 normal.
How is the visual acuity test scored?
20/40 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. Outside the United States, the visual acuity is expressed as a decimal number. For example, 20/20 is 1.0, 20/40 is 0.5, 20/80 is 0.25, 20/100 is 0.2, and so on.
How is the Snellen test scored?
Recording Snellen Results Top number equates to the distance (in meters) at which the test chart was presented (usually 6 m), Bottom number identifies the position on the chart of the smallest line read by the 'patient'. E.g. 6/60 means the subject can only see the top letter when viewed at 6 m.
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