What Does It Mean to Have 20/20 Vision?

Apr 14, 2023 | Vision

If you’ve ever had an eye exam, you may have heard the term “20/20 vision.” But what does it really mean to have 20/20 vision, and is it the same as having “perfect” vision? Let’s take a closer look at 20/20 vision and what it means for your eyesight.

What is 20/20 vision?

The term “20/20” refers to the sharpness or clarity of your vision (or visual acuity) at a distance of 20 feet. If you have 20/20 vision, it means that you can see an object clearly from 20 feet away. In other words, your visual acuity is considered “normal.”

It’s important to note that 20/20 vision doesn’t necessarily mean you have perfect vision. While it’s often considered the standard for normal eyesight, many other factors can impact your overall visual health and function.

How is 20/20 vision tested?

There are several ways to measure visual acuity, but a Snellen eye chart is the most commonly used. It consists of descending rows of letters and numbers that vary in size. The chart is typically placed 20 feet away, and you’ll be asked to cover one eye and read the smallest line of letters you can see clearly. If you can read the line marked “20/20,” it means you have normal visual acuity.

If you’re unable to read the 20/20 line, your eye doctor may ask you to move closer to the chart or try a different line to determine your level of visual acuity. They may also perform other tests to assess your overall eye health and identify any issues that could be impacting your vision.

What factors can impact visual acuity?

Having 20/20 vision doesn’t mean you have perfect vision. It only measures the clarity or sharpness of your vision at a distance. Many other factors can impact overall vision, including:

  • Refractive errors, such as nearsightedness, farsightedness, and astigmatism
  • Age-related eye changes, such as presbyopia
  • Eye diseases or conditions, such as cataracts, glaucoma, or macular degeneration
  • Other health conditions, such as diabetes or high blood pressure

If you’re experiencing changes in your vision or have concerns about your eye health, it’s important to schedule an appointment with an eye doctor. During a comprehensive eye exam, they can identify any issues and recommend the best treatment. They can also prescribe glasses or contact lenses if you need them to see clearly. Call us today to schedule an eye exam at our office in Decatur, AL!