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Optometrist in Bardstown, KY

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Home » Eye Health » Eye Exams » Common Tests » Snellen Chart

Snellen Chart

Hopefully by now, we’ve all seen one. The projected or wall-mounted Snellen eye chart, usually topped by the big letter “E”, is a common visual acuity test used to measure your sharpness of vision at multiple distances.
 
Arranged as a pyramid of sorts, the letters in the Snellen chart are specifically chosen and arranged to test your sharpness and clarity of vision at a baseline distance of 20 feet. During a visual acuity test, the Snellen eye chart is viewed as a projection, or mounted on a wall.
 
Handheld versions of Snellen charts are used for testing near vision as well.
 
By viewing or reading each line from top to bottom (with one eye covered at a time), your eye doctor can gain a general approximation of the quality of your visual acuity, or sharpness. Where a line of characters begin to become difficult to see is the approximate measurement of your vision.
 
The Snellen chart serves as a beginning—not an end—to a comprehensive eye examination.

What does “20/20” vision mean?

Snellen charts help to determine a baseline for your vision in each eye—a baseline typically measured against “20/20” vision. This means when you are 20 feet away from an object, you can comfortably see details that most people with normal vision can also see at 20 feet distance.
 
If you have 20/30 vision, that means what you see comfortably at 20 feet, can be seen by a person with “normal” vision at 30 feet. Your vision is weaker, in other words.
 
Conversely? In the rare instances where vision may test better than normal on a Snellen chart, a value of 20/10 vision means that you can see clearly from a distance of 20 feet, what a person with normal vision sees well at a distance of 10 feet. Make sense?
 
In fact, if you look closely at a Snellen eye chart, you’ll see the vision values associated with measuring your vision on the right or left side of each line of characters.
 

Special thanks to the EyeGlass Guide, for informational material that aided in the creation of this website. Visit the EyeGlass Guide today!

Covid-19 Update    4/25/2020

We are so pleased to announce that we will start seeing patients again for routine care on Monday, April 27th.  While we transition into the new normal, we want to make sure that you know what to expect when entering our office and to know that we are taking extra precautions for the safety of our patients and staff.  We also have several patients on a waiting list that we must accommodate 1st, but please feel free to call the office to schedule an appointment at 502-349-2020.  You can also schedule appointments and access new patient forms at www.cecilfamilyeyecare.com.

A few things that are necessary to follow CDC and state guidelines, as well as minimize risks, are listed below:

Rest assured that we will do everything we can to take care of your needs, in a safe and clean environment.  We appreciate your support and patience during this unprecedented time. Please call or text the office at 502-349-2020 with any concerns or questions.

Stay safe and healthy!

Cecil Family Eyecare