Why do we Use Eye Charts

Snellen, Test, Chart, Diagnostic, Doctor

If you’ve ever had an eye test done in an eye doctor’s office it’s likely that you’ve heard about the Snellen Eye Chart. It was named after a Dutch eye doctor called Herman Snellen who developed it in 1862. What does the Snellen chart consist of? The Snellen chart consists of 11 rows of capital letters. The very first letter at the peak of the eye chart is a capital E. There are also a series of subsequent rows of capital letters that become progressively smaller from line to line. The smaller the rows of capital letters the sharper the visual acuity. For instance, the line that says 20/20 is forth from the bottom line and is then followed by the 20/15,20/10 and the 20/5 line. If you are able to read the bottom row of the smallest letters then you have excellent vision.

The patient is needed to stand out from a distance of approximately 20 feet to read the letters without the help of glasses or contacts. The patient is asked to cover one eye and read the smallest letter he can see from the eye chart. In case you have 20/20 vision this is considered normal eyesight. 20/20 vision means you could see clearly at a distance of 20 feet what the average person is able to see at that particular distance.

Therefore, it cannot detect whether you have any underlying medical problems associated with your vision condition. According to developmental optometrist Dr. Kellye Kneuppel, the Snellen chart only detects nearsightedness and misses other vision conditions such as Astigmatism and farsightedness.

What’s more, Dr. Knueppel explains that vision problems that kids experience associated with the lack of teamwork between the two eyes and difficulty tracking lines are vision conditions that go undetected even with a Snellen eye chart test. These undetected problems can cause academic problems and learning difficulties. For this reason, the American Academy of Ophthalmology recommends a baseline eye exam that gives a comprehensive evaluation of a patient’s eye health. Such a comprehensive eye exam can detect underlying issues such as Glaucoma, eyesight issues related to the retina, eye problems associated with Diabetes or high blood pressure to name a few. Furthermore, it can detect problems focusing when reading and vision issues associated with lack of teamwork involving both eyes.

When it comes to getting a detailed examination that determines the state of your general eye health a baseline eye exam is recommended. On the other hand when it comes to adjusting vision conditions a reliance on glasses or contacts will not tackle the underlying causes of your vision issues. If you are looking for a natural solution to solve your vision problems while addressing the root causes of poor vision, then, an eye exercise program to improve your eyesight naturally is highly recommended.

Such a program corrects or reduces vision conditions related to nearsightedness, farsightedness and astigmatism. You will also find that the diligent and regular practice of these simple eye exercise techniques can provide certain fringe benefits. Ultimately, all of these are skills that are necessary for academic achievement and result in an increase in your overall eye health.


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