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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!

We are moving 2018

391 Evans City Road Butler, PA 

Spring of 2020

 

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Attention Patients:

For the health of our patients, staff, and our community, Butler Eye Care and Chicora Eye Care will be closed to the public beginning Thursday, March 19th until further notice.

We will continue to offer the following services:

Please call our office at 724-283-8144 during office hours and our staff can assist you.

Upcoming Office Hours: Monday – Fridays: 10am – 3pm at our Butler Office only (our Chicora office is closed)

Please do not come to the office during these hours. Call first, and our staff will assist you. * For emergency eye care, please contact us at 724-283-8144. We plan on launching a telemedicine service for ocular emergencies thereafter.

As a local, family-owned business, we SINCERELY appreciate each and every one of you for trusting us with your eye care. Please keep yourself and your loved ones safe during these difficult times.