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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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Dear patients,

As your eye care professionals, your well-being is important to us! After careful consideration of the most recent recommendations of the CDC, AOA and FDA regarding the current COVID-19 situation, we feel that it is best for you, our team, and our community to limit our physical interactions with one another until the threat of the virus has passed. Therefore, we will be closing the office on Friday, March 20 at 12:00 noon and will remain closed until at least March 27, but most likely longer.

In the meantime, if you have a true ocular emergency, please call 850-216-2020 to reach the doctor on call. We will be doing our best to manage all urgent eye problems in such a manner as to limit any possible spread of the virus.

For those patients with appointments scheduled for the week of March 23, we will be calling to reschedule your appointments once we have a better estimate regarding when we will reopen. Because our schedule is already quite full for the next several weeks and because we realize that many of you have already waited several weeks for an appointment, we will be adding additional time slots to the weekly schedule as we attempt to accommodate each of you in a timely manner. We ask for your patience and your flexibility in this matter.

In addition, if it appears to still be reasonable, we plan to be open briefly on Wednesday, March 25 from 10:00am -12:00 pm to allow our patients to pick up any previously-ordered glasses and contact lenses. Please call the office when you arrive and we will deliver your eyewear to your car.

If you need to order contact lenses during this time please email the office at

contacts@tallahasseeeyecenter.com. Be sure to include your contact information and someone will reach out to you. We will do our best to monitor this email daily.

Online ordering is also available at www.tallahasseeeyecenter.com

We will be closely monitoring the situation and will notify you as soon as we make the decision to reopen. It is our hope that we will soon be on the other side of this situation and that our community will remain healthy and strong.

Stay well, Drs. Whaley, Strickland and Hough