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Located in Pickering Town Centre,
Inside LensCrafters on the upper level of the mall.
Open 7 days a week
New patients and Walk-in patients welcome
Free Parking
Wheelchair accessible
Serving all areas (Scarborough, Pickering, Ajax, Whitby & Oshawa)

We now offer direct billing.

We have moved!! We are now located on the opposite end of the mall, upper level, across from Laura Secord, inside the new Lenscrafters!

Home » Eye Exam Q&A » 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 URGENT NOTICE

COVID-19 NOTICE

We are now open for routine eye care. We have taken extensive measures to keep our staff and patients safe. Please call or email (ptcoptometricclinic@gmail.com) prior to coming in so that we can book a time and notify you of our safety protocols in order to maintain social distancing.

If you need to order your contact lenses please call or email us and we will ship them to you directly. If you prefer, our Optometrists are still offering virtual eye care when possible.

We ask that if you or someone you live with has been ill in the last 14 days, you have traveled outside Ontario in the last 14 days and/or you have been diagnosed/exposed to COVID-19 in the last 30 days that you refrain from making an appointment at this time.

Thank you for making our clinic a safe space.