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Medically Reviewed
Written by Pooja Rawat, Medical Content Writer
If you’re wondering what 6/6 vision means,
here’s the simple answer for you: 6/6 vision (or “6 by 6 vision”) means normal visual acuity. You can see an object clearly from 6 metres away as a person with normal eyesight should. It represents normal visual acuity, not perfect eyesight.
In places around the world that use the metric system, 6/6 vision is known as 20/20 vision.
A 6/6 vision test only let you know how sharp that “picture” is. But, many people are under the impression that 6/6 vision means “perfect eyes” or that every vision number corresponds to a specific spectacle power. Neither of the assumptions are true.
Read this blog to know what these numbers means in reality.
Also Read : Eye Stye(Sty) Explained: Causes, Symptoms, And How To Treat Them
What Does 6/6 Vision Mean?
6/6 vision (or “6 by 6 vision”) mean that you can read the standard line on a Snellen eye chart from a distance of 6 metres, signalling normal visual acuity.
Eye care specialists call this visual acuity. However, it is not a measure of overall eye health such as colour vision, peripheral vision, or depth perception.
Here is the breakdown:
- Second 6: The second number is how far away a person with normal visual acuity would have to be to see the object with the same clarity and sharpness as you.
So, if both numbers are same, your distance vision is considered normal.
For example, if you have 6/12 vision, you see an object that’s 6 metres away as clearly as most people would see it if they stood 12 metres away. This means your vision is better than normal.
Read More: Understanding Blurred Vision: Common Causes & Warning Signs
Is 6/6 Vision the Same as 20/20 Vision?
Yes.
The only difference is the unit of measurement used.
Countries like India, Australia, and the UK mainly use 6/6, while the US uses 20/20.
Vision Standard | Measurement System | Meaning |
6/6 Vision | Metric (metres) | Normal distance vision |
20/20 Vision | Imperial (feet) | Normal distance vision |
Is Having 6 by 6 Vision the Only Thing That Matters When It Comes to Eyesight?
Having 6 by 6 vision is crucial for seeing the world clearly, but other parts of vision matter, too.
Those include:
- Color vision.
- Eye alignment, which you need for depth perception and 3D vision.
- Low-light or night vision.
- Peripheral vision.
How Is 6/6 Vision (the Metric Equivalent of 20/20 Vision) Measured?
Eye specialist use a Snellen Chart, which contains rows of letters that gradually get smaller.
During the test:
- You will be standing 6 metres from the chart.
- One eye is covered.
- You will be told to read the smallest line you can identify.
- The other eye is tested separately.
- At the end, both eyes are tested together.
If you read the 6/6 line accurately without experiencing too much squinting or guessing, your visual acuity is considered normal.
Visual acuity usually takes only a few minutes test and is quick and painless.
What Do Other Vision Numbers Signal?
Not everyone has 6/6 vision. Higher second numbers means that your vision is less sharp.
Vision | What It Means |
6/5 vision | Better than average vision. You can see at 6 metres what most individuals require to be 5 metres away to see. |
6/6 vision | Normal visual acuity. |
6/9 vision | Mildly decreased distance vision. |
6/12 vision | Moderate reduction in visual sharpness. |
6/18 vision | Noticeably blurred vision at distance. |
6/24 vision | Significant visual impairment requiring evaluation. |
6/36 vision | Severe reduction in distance vision. |
6/60 vision | Very poor vision. You see at 6 metres what a person with normal vision sees from 60 metres away. |
Does 6/6 Vision Mean You Have Zero Eye Power?
No.
This is one of the biggest misconceptions.
Many internet users search for “6 6 vision means how much power.”
The truth is:
6/6 vision does not tell your spectacle power.
A individual can:
- Have zero power and 6/6 vision.
- Wear glasses with -3.00D and still achieve 6/6 vision.
- Have LASIK surgery and achieve 6/6 vision.
- Wear contact lenses and see 6/6.
What is the Difference Between Visual Acuity & Refractive Power
Here is the simple difference:
Visual Acuity | Spectacle Power |
Tells you how clearly you see | Tells you lens prescription |
Expressed as 6/6, 6/9, etc. | Expressed in Diopters (D) |
Determined with the help of a Snellen chart | Determined by refraction test |
6/9 Vision Means How Much Power?
Some people has very common question:
“6 9 vision means how much power?”
Unfortunately, there is no fixed answer.
A person with 6/9 vision may have:
- Mild myopia
- Mild hyperopia
- Astigmatism
- Temporary eye strain
- Dry eyes
Their prescription might be:
- -0.25 D
- -0.50 D
- -0.75 D
- Or sometimes no prescription at all
Only your eye doctor can determine the actual power after comprehensive eye examination.
Why might I not have 6/6 vision (or “6 by 6 vision”)?
Refractive errors are the most common causes of vision that’s less than 6 by 6.
For example:
- Farsightedness (hyperopia).
- Nearsightedness (myopia).
- Presbyopia (age-related loss of the ability to focus on close objects).
- Astigmatism.
Read More : Myopia and Hypermetropia: Differences, Causes & Treatment Options
Other eye conditions can also impact how well you see are:
First 6: The 6 metres distance between you and the eye chart.
- Cataracts.
- Corneal diseases.
- Diabetes-related retinopathy.
- Glaucoma.
- Retinal diseases.
- Lazy eye.
FAQ's
Can you improve to 6/6 vision?
How can you maintain 6/6 vision?
Does 6/12 vision means how much power?
Conclusion
Having 6/6 vision means you see the things around you with normal clarity and visual sharpness (visual acuity). But, It does not measure eye health, colour vision, peripheral vision, or depth perception.
If your vision is 6/9, 6/12, 6/18, 6/24, or 6/60, do get panicked as these numbers are starting points not the final diagnoses. Many causes of reduced vision are easily treatable under the doctor’s guidance and the treatment options may include glasses, contact lenses, or modern vision correction procedures. All you need is to follow your doctor’s advice.
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Disclaimer: This blog is for informational purposes only. Consult your doctor only for any vision related issues.
