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Westwood, NJ 07675

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Home » 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!

IMPORTANT UPDATE: PLEASE READ ENTIRE MESSAGE

Valley Eye Associates is OPEN for all patients and appointment types.

 

Below are the safety protocols that have been put in place for all visiting patients:

  1. All equipment is cleaned with 70% isopropyl alcohol before and after each use.
  2. A protective plastic shield has been installed at the front check in area.
  3. Upon arrival each patient will need their temperature checked with a non-contact thermometer.
  4. We will use our online check-in form as well as requiring any insurance cards or documents to be sent to us via text/email if possible.
  5. All payments can be made with credit card by phone.
  6. All visitors will be required to wear a face covering or mask at all times. You will NOT be allowed to enter without wearing one.
  7. All pick-ups, adjustments, and other visits will require an appointment time. This is needed so that we know when to expect you and can distance you from anyone else.
  8. Please come at your scheduled time. If you arrive too early you may have to wait in your car. If you arrive too late for us to perform the necessary tests for your exam you may have to be rescheduled.
  9. Frames that are tried on must be put into a separate box. Frames are disinfected by saturating in a 3% hydrogen peroxide solution for a minimum of 10 minutes, dried, and then stored for 3 days before being put on display.

Feel free to call us at 201-664-0847 during our business hours or visit our website at www.2020nj.com to reschedule your appointment.

Thank you.