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Envision Optique
Dr. Michael R. Obregon
Optometric Physician

We are located in the heart of Coral Gables, 3 blocks south of
Miracle Mile - facing the circle park

Our staff members speak English, French and Spanish

Call Us! (305) 440-4465 Schedule Appointment Text Us! (305) 444-9600
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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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Dated: June 5, 2020

To all our patients and customers:

Envision Optique is OPEN FOR BUSINESS. We are providing all exam services in a limited capacity, as well as optical sales and dispensing by appointment. Due to COVID-19, we are taking extra precautions to maintain a healthy and safe environment for your appointment:

To ensure those visiting Envision Optique are safe, we are asking the following: All patients must wear a face mask and attend their appointment alone . Patients will receive email/text links to our Covid-19 Screening Form, as well as History and Consent Forms if needed, to fill out and submit remotely. These must be received prior to the exam. Additionally, all patients will receive hand sanitizer and touchless temperature screening.

Please Note: Due to limited scheduling, we are strictly enforcing our Broken Appointment Policy. (We require 24Hr. notice of changes to confirmed appointments, subject to $50 charge.)

Stay healthy and safe.

- Dr. Michael Obregon and Staff

COVID-19 Update. We Have Re-Opened. Click Here for Our Safety Protocols.