What is the 20/40 Line on an Eye Chart?

The Snellen eye chart, designed by Dutch ophthalmologist Hermann Snellen in 1862, is one of the most well-known graphs used to measure visual acuity. During an eye exam, one eye is covered and the patient is asked to read aloud the letters in each row of the chart, starting from the top. The 20/40 line on an eye chart is the line that a person must be able to read most of the letters from in order to get an unrestricted driver's license in most states, including Ohio. It is important to note that a full eye exam is always recommended as the Snellen eye chart alone may not detect near vision problems or other vision and eye health issues.

A legally blind person needs a distance of two feet to detect letters on a standard eye chart that is 20 feet apart. By having you read the graph, your ophthalmologist can determine if you have difficulties with distance vision and can determine which corrective lenses can be used to improve your vision. If your eyes are very dry and your doctor can't help you solve that problem, both contact lenses and LASIK could be uncomfortable for you.When using Washington ophthalmologist products or services, it is important to review their terms of use and privacy policies. NVISION makes no warranty as to the validity or accuracy of the information published on this website by Eye Doctors of Washington, or of any products or services provided by Eye Doctors of Washington.

As such, NVISION is not responsible for any damages you may incur as a result of your use or information you receive or send to Eye Doctors of Washington.

Gregor Potzl
Gregor Potzl

Avid beer practitioner. Devoted travel fanatic. Extreme burrito aficionado. Unapologetic baconaholic. Professional internet fan.

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