Since a standard Snellen visual acuity chart is viewed at 20 feet, this type of chart is difficult to fit into a typical exam room. Typically, the largest letter corresponds to a 20/200 letter size, while the smallest letters correspond to 20/10 letters. When you view the eye chart, you may notice that different letter sizes correspond to varying levels of visual acuity.Ī Snellen vision test starts with the biggest letter at the top, descending to the smallest letters at the bottom. Most ophthalmologists use the Snellen eye chart to measure visual acuity. If you are diagnosed with a refractive error, such as astigmatism, myopia (nearsightedness), or hyperopia (farsightedness), you will need corrective lenses to fix the vision problem. The larger the second number, the poorer the visual acuity. This means someone with normal vision can see the letters at 40 feet, but you can only see those same letters at 20 feet.
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For example, maybe the smallest letter you can read on the chart corresponds to 20/40. The second number varies depending on how small of a letter you can see. In other countries, many optometrists use a test distance of 6 meters. This number usually does not change, unless you are using a different eye chart and test distance. In this case, the first 20 refers to a test distance of 20 feet. In other words, how far you are standing from the eye chart. With a measurement of 20/20, the first number indicates the test distance. For example, when your eye doctor asks you to read letters off a chart during an eye exam, they are measuring your visual acuity. Visual acuity is how clearly you see at a specific distance. To stay in the know about the true state of your vision and eye health, make sure to book regular visits with your local doctor of optometry.People associate the numbers “20/20” with normal vision, but what does it really mean to have 20/20 vision?Ģ0/20 is a term to describe normal visual acuity. Glaucoma, a progressive eye disease caused by increased pressure in the eye, demonstrates that you can have all the signs of good vision while unknowingly living with an eye disease that is one of the leading causes of blindness in Canada. It should be noted that the quality of your eyesight and eye health are not mutually exclusive. A few of those factors include eye focusing, coordination, movement, teaming, as well as visual perceptual skills and color vision. Optometrists take multiple factors into consideration when determining the quality of your vision. … if the change in vision is to 20/200 or worse, the person will still keep some vision but will be classified as “blind”. If you have 20/60 vision, this means you can see at 20 feet what a person with good vision can see at 60 feet.
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This simply means that the eye being tested is able to see an object at 20 feet as well as any eye with very good vision. 20/20 vision only represents the clarity of your vision when viewing objects 20 feet in the distance, CNIB explains:
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In fact, it’s highly probable that many people don’t even know what those numbers means. “I have 20/20 vision” are words you may have uttered while bragging about having tip-top eyesight, however, it’s not that simple. If you’ve been postponing regular visits to a doctor of optometry because they once told you that you had 20/20 vision, then you should keep reading.