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Home » What's New » Understanding the Eye Chart

Understanding the Eye Chart

Eye charts of different variations have become a standard in vision screenings and eye exams. One of the most familiar charts associated with vision is the Snellen eye chart, designed by Dutch ophthalmologist Hermann Snellen in 1862 to measure visual acuity- how well you can see at various distances.

Although there are variations of the Snellen chart used today, a traditional Snellen chart has eleven lines of block letters. The first line has one very large letter, which is one of several letters, for example E, H, or N. The following rows have increasing numbers of letters that become smaller in size as you read from the top to the bottom of the chart. The letters used on the chart are C, D, E, F, L, N, O, P, T, and Z.

When taking a vision exam, one eye is covered and you are asked to read the letters of each row aloud beginning at the top of the chart. The smallest row that you can read correctly indicates the visual acuity in the eye being tested.

The chart is positioned at a distance of 20 feet in the United States or 6 meters in the rest of the world. The term 20/20 vision is used to indicate the clarity and sharpness of your vision measured at a distance of 20 feet. If you have 20/20 vision, you can see clearly at 20 feet objects that can normally be seen at that distance. If you have 20/40 vision, it means that you need to be as close as 20 feet to see what a person with normal vision can see at 40 feet. The largest letter on an eye chart often represents an acuity of 20/200 which is associated with the term "legally blind."

You will be asked to read the letters one eye at a time. Some people can see well at a distance, but are unable to bring nearer objects into focus, while others can see items that are close, but cannot see them far away. By having you read the chart, your eye doctor is able to ascertain whether you have difficulty with distance vision and can determine which corrective lenses can be used to improve it. Near vision problems or other vision and eye health issues may not be detected with the Snellen eye chart alone, so a comprehensive eye exam is always recommended.

The next time you hop into the chair at your optometrists' office, you'll be able to understand why you have to read the letters on the chart in front of you and what the results mean for your vision.

COVID-19 Updates

Dear Valued Patients,

We are very excited to announce that based on the guidelines of the CDC and the American Optometric Association, our practice will begin seeing patients this coming Friday, May 15, 2020.

Our new hours of operation for the very near future will be Wednesday’s, Friday’s and Saturday’s from 11:00 am – 6:30 pm. Patients will be seen on an appointment-only basis for the time being.

After going through challenging weeks, we appreciate your patience and understanding more than ever!

Our team is going beyond the expectations of healthcare facilities to ensure everyone’s safety. To achieve the highest level of protection, we are implementing new safety protocols, including regular UV-C sanitization between patients, social distancing, etc. Most notably:

As always, feel free to contact our office with any questions or to schedule an appointment. We look forward to seeing you soon!

Sincerely,Lakeline Eyecare

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Our practice will reopen this Friday, May 15!!! The health and safety of our patients and staff continues to be a priority. Again, thank you for choosing Lakeline Eyecare, and we wish you and your family the best in health. Click here to read more.

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