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Home » Your 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!

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As our community copes with the fast-moving spread of the COVID-19 coronavirus we hope you and yours are in good health during these stressful times.

Public officials have asked businesses to close down for a limited time while a local quarantine begins. 

We will be available for eyecare emergencies by appointment. Please contact us at 973-728-1101 if you have any questions and we will respond back as quickly as we can. All other emergencies please call 911.

If you need to order contact lenses you can do so by going to our website www.westmilfordvisioncenter.com and click on the contact lens order link on the left hand side of the screen.

When we are given the green-light to renew normal business operations we will update you. We thank you for your patience during this interruption and hope to see you when we re-open, happy and healthy.

West Milford Vision Center

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Even though we are closed we are still available to serve our patients. We are just a phone call away!

If you have an eye emergency, please contact us- we’re here for you.

If you need to order contacts, please visit our website and do it online.

Finally, we can also help you with eyeglass repairs or replacements.