Skip to main content

Eyeland Optometry

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!

COVID 19 update webheader 750×328

Please Read Before Continuing!

Please take note that our clinic will remain by appointment for all visit types. This will allow us to serve patients to the best of our ability.

The only thing required for your appointment will be a mask.

We are closed for lunch from 12:30-1:00 & closed every second Saturday, every second Monday, every Sunday & Holidays.

If you are needing to pick up products such as glasses, contacts, dry eye products, anti-fog lens solution, if you are needing a frame adjustment or would like to purchase new glasses, please call us to book an appointment.

You can book your eye exams & non emergency medical appointments from our home page. If you are needing dilation drops, contact lens check, a follow up appointment or any other appointment that is not listed online, please call us at 780-460-9673. These appointments cannot be booked online. Also, Dr. Roed is only available for appointments until 2:30 until further notice. 

You can also send us a contact lens order request from our homepage. Your contact lenses will be shipped directly to you. Please note that we cannot deliver contacts to PO Box addresses. If you are due for your annual eye exam, we will contact you back to book your eye exam before we order contacts.

We appreciate your time & understanding.

102749292 1369379973265705 3829409840794108751 n