Having 20/20 vision does not mean you can see perfectly
One of the most common terms people throw around in regards to your eye health is 20/20 vision. But what does it really mean? 20/20 vision is a measurement used to describe a person’s visual acuity, or the quantity of someone’s vision, if you will.
The sharpness (another descriptor for visual acuity) of your eyesight is determined with the help of an eye chart where you must identify letters and numbers. If you can see 20/20, it means that you can clearly see an object when standing 20 feet from it.
However, just because your vision is sharp does not mean it is perfect. 20/20 vision refers to the clarity of vision at a distance, not perfection. According to some industry experts, 20/10 is believed to be the maximum visual acuity of human eyes.
20/20 Vision Defined
The term “20/20 vision” is an expression that is referencing how well you can see at a distance. The first number is representative of how far away you are from the eye chart, and the second number is the size of the letter you are able to read from this distance.
Someone with 20/40 or 20/50 vision, for example, are ready letters that the majority of people with 20/20 vision could read from 40 or 50 feet away. If you have 20/15 vision, your eyesight is sharper than the average person.
Although 20/20 vision is a term we’ve all heard before, just 35 percent of all adults have 20/20 vision without the help of corrective glasses, lenses, or surgery. While these corrective measures can help improve visual acuity in a major way, there is still an estimated 25 percent of Americans adults that cannot see well.
What is Visual Acuity?
As we’ve discussed, visual acuity can be looked at as the overall sharpness or clarity of your vision. It is very important to your health because it helps us gauge how well you can see, out of both eyes separately and together. With the help of these common visual acuity tests, your First Eye Care McKinney optometrist will better understand your vision needs.
Levels of Vision
We’ve touched on this a bit, but let’s go over the different levels of vision before we go any further:
- 20/20 – Normal vision
- 20/40 – Can read most printed material; minimum to pass driver’s license test
- 20/80 – Can read an alarm clock from 10 feet away
- 20/200 – Considered legally blind
Having 20/20 vision does not mean you can see perfectly, but it does mean that your vision is clear and does not require any correction. As we get older, it is only natural for our vision to change, resulting in the need for glasses or contacts. To have your visual acuity measured or if you have any additional questions about 20/20 vision, please contacts First Eye Care McKinney and schedule a comprehensive eye exam.