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4130 Truxel Road, Suite D Sacramento, CA 95834

4130 Truxel Road, Suite D Sacramento, CA 95834
916.928.8383

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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 happy to announce that beginning May 11th, we will resume patient care!  Out of an abundance of caution, and guidance from various health agencies including the CMS, CDC, and CDPH, we will be following various safety protocols to protect the health and safety of our patients and staff.  The following protocols apply whether you are coming in for an eye exam, coming to pick out new glasses, or picking up glasses or contacts. Prior to entry there are 3 important steps:

1.  Bring your own mask: You must bring your own mask or face covering!  It is required to be worn at all times within the office (we are unable to provide masks from the office; if you do not bring a mask, we will have to reschedule your visit for a later date).

2.  Body temperature reading: Staff will be administering thermometer readings, and must be within normal range for entry into the office.

3.  Attest to good health: You must attest to good health, with no symptoms of fever, cough, shortness of breath, chills, sore throat, loss of taste/smell, and have not had contact with another person with COVID19 in the past 14 days.

 In addition, we will include limiting the number of patients in the office.  Therefore, you may be asked to call the office upon arrival, and may need to wait outside or in your car until you are called into the office.  Only patients will be allowed in the office (please have spouses, relatives, and friends wait outside of the office).  Exceptions include minors and dependents...may be accompanied by one adult parent or caretaker.

Sincerely,

The Natomas Optometry Team