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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!

To Our Beloved Patients...

We are closely monitoring the fluid situation and want to be extremely vigilant to do our best to flatten out the curve for our community, country and globally. To respect social distancing as recommended by the CDC, the City of Keller, and our various Medical and Optometric Associations, it is with great considerations we must implement some changes to our schedule starting June 1st, 2020. Thank you all for your patience and understanding during this challenging time as we navigate through a global crisis.

Our hours of operation will be 8:30am-5pm Monday through Friday, closing for lunch from 12:00-1:00. We are open the 2nd Saturday of every month by appointment only, from 8:30am-2pm.

The front door will be locked, and only scheduled patients will be allowed in the office one at a time. If you arrive at our office, please call 817-562-2020 and let us know the nature of your visit. We will do our best to help you.

We will be providing curb side delivery for ALL materials such as glasses and contacts lenses.

We will be conducting temperature checks of anyone entering the office and have them use hand sanitizer at the door.

Questions that will be asked of patients prior to appointment...

1. Have you or anyone in your household been out of the country in the last month or have traveled to any high-risk areas?

2. Have you or anyone in your household been sick or experiencing any flu or cold like symptoms?

3. Are you having any major vision changes, ocular pain or discomfort? If not, then you may be asked to schedule at a later date.

May God bless you and your family,

Baker Family Eyecare