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What is 20/20 Vision? How to Convert Diopters to a 20/20 Measure

We all hear the term 20/20 vision thrown about to mean anyone who has healthy eyesight. But what does it mean? And how does it convert to the lens prescription your optometrist gives you, measured in diopters? By the end of this article you’ll be an expert on the definition and understanding of 20/20 eyesight.

What is 20/20 Vision?

The average human being with healthy eyesight has 20/20 focus. This is a benchmark measure of what you should be able to see at a distance of 20 feet.

This measure only really becomes important when people stray from the norm. For instance, if you have 20/100 vision, it means that other people can see clearly from 100 feet away, what you can only see at 20 feet. It’s a big disadvantage.

Can You Have Better Than 20/20 Eyesight?

Yes, it is possible – having 20/20 focus is merely the average visual acuity for a healthy human being. But there is nothing stopping people from being above average and gaining better than 20/20 vision.

Some fighter pilots use eye exercises to attain 20/10 vision, while the world record belongs to a man naturally achieved 20/8 focus by training his eyes for better vision. Incidentally, eagles have natural vision of 20/2 – hence the expression eagle eye, which means an exceptional eye for detail.

What are Diopters?

If you are nearsighted (anything worse than about 20/50 vision), your optometrist will write you a prescription to improve your long distance vision. This describes, in a measure called diopters, the refractive power of your new glasses or contacts.

You will get a separate diopter value for each eye – often one eye is slightly weaker than the other. If the measurement has a minus (-) before it, you are nearsighted and have trouble seeing things in the distance. If there is a plus (+) before it, you are farsighted and have trouble seeing things up close.

However, scientific studies have found that wearing prescription lenses weaken the eyes by forcing them to adapt to the lens.

You have probably noticed this yourself when you get a new pair of glasses. The world appears ultra-clear and you have to get used to the strong lenses. Then, within days, they feel normal and are eventually too weak altogether.

Therefore, you should reduce your dependency on corrective lenses if you want to help prevent further vision deterioration. There is much anecdotal evidence that eye exercises will help improve your natural vision.

How to Convert Diopters to 20/20 Vision

While the 20/20 vision system measures how well you can see compared to a healthy benchmark, diopters measure the focusing power of your glasses.

There is a relationship between the two, shown in the table below. This gives you a very rough conversion between diopters and the 20/20 measurement – but bear in mind there is a lot of variation between individuals.

 

Diopter Measure
20/20 Measure
-1.00
20/40
-2.00
20/80*
-3.00
20/150*
-4.00
20/300*
-5.00
20/400*
-6.00
20/500*

*Higher diopter values are harder to calculate because it depends on the person – some sources cite a whole range between -4.00 and -6.00 to reflect 20/400 vision. So these figures are an approximation. Note how the 20/20 measure doesn’t increase consistently, and may actually increase exponentially beyond -6.00 (severe myopia).

improve-your-vision-with-eye-exercisesImprove Your Vision – Naturally

Eye exercises must be the best kept secret in optometry.

It’s a tragedy that we are brainwashed into wearing glasses (which studies show weaken vision over time) or having LASIK eye surgery (which comes with real risks like corneal damage).

Don’t give up on your eyesight just because you started wearing glasses all those years ago… try eye exercises right now for free!


Want Better Eyesight  
"My 49th birthday is right around the corner and I do not need glasses anymore. I can do my artwork and I can read like a normal person. Life is good!" - Lynda Makara, MT, on Rebuild Your Vision
 
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"I did the program for 25-35 minutes a day for a full 30 days... I started seeing an improvement in my vision after a couple of weeks. My vision was an awful 20/400. I went to the optometrist to see how much I improved. She said "your eyes got a lot better" and asked me what I did. She didn't have much else to say after that except "your vision is now 20/200". I only wish I would have known about this technique 10 years ago before my vision got so bad." - Roger Sigler, TX, on Rebuild Your Vision
 
"My son very successfully used your program. After about 30 days of using your training he improved from 20/70 and 20/50 to 20/30 and 20/20. Thank you!" - Ralf Haug, FL, on Rebuild Your Vision
 
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