When people talk about perfect vision, they often use the phrase “20/20”. However, having 20/20 vision doesn’t actually mean someone has perfect vision. It just means that they can see someone 20 feet away very clearly. This narrows the idea of perfect vision to a very specific definition. But perfect vision actually relies on many different factors such as peripheral vision, depth perception, coordination, and night vision. So, what is perfect vision?
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20/20 Vision
Although having 20/20 vision does not actually constitute for absolute perfect vision, it does still stand as the standard for every eye exam in America. When you pay a visit to the eye doctor, they’ll likely have you read an eye chart with letters that are a different size on each line. One of the lines is what letters should look like at 20 feet away. If you can read these lines, you have what is called “20/20 visual acuity”.
However, it’s actually possible to read even smaller letters that fall on the lines below. This is called 20/10 or 20/15, depending on the line. You are able to read letters that the majority of people can only read at 10/15 ft. This situation reversed would mean that someone has less visual acuity, and would look something like “20/40” vision. Here’s a closer look at what it means to have low vision or legal blindness.
The reason why 20/20 vision is considered “perfect” in America, is because it is the standard for which no additional aid, such as glasses or contacts, is required to see better. This standard may be different in other countries.
In addition, it’s important to note that even if someone has 20/20 vision or better, they may still have trouble with other parts of their vision. A basic 20/20 chart test doesn’t account for colored or moving objects or objects with similar brightness as their background. Other examples of vision impairment are double vision, seeing halos, or poor night vision.
Neurological & Physical
Other factors are more neurological and physically based. They are:
- The sensitivity of the nerves in the vision centers of the brain and retina
- How sufficiently and accurately the lens and cornea of the eye can focus on light onto the retina
- How well the brain interprets information from the eyes
In order to truly have good vision, all of these things must be in top-notch shape. However, there technically is no one quantifiable way of defining “perfect” vision. A better question would include specifics for the individual or task — such as “what is perfect vision for a baseball pitcher?”
Better Vision
If you’re looking to improve your vision, iLasik surgery may be a great option for you. In general, iLasik surgery is great for people who are looking to improve their ability to see far away or correct any blurriness issues. This type of surgery is also great for people who are very active and are unable or uncomfortable wearing glasses or contacts.
If you’re searching for a life with better vision, give Advanced Eye Medical a call or visit our website. We are happy to discuss your options with you at your next consultation.