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www.reference.com/health/20-600-vision-d6a8376da94ea800

The American Foundation for the Blind states that 20/200 vision is the clinical definition for legal blindness. Therefore, a person with 20/600 vision is considered legally blind. With 20/600 vision, an individual sees people only as shapes, WPTV indicates. CNN explains that this level of eyesight impairment is comparable to a newborn's eyesight.

answers.yahoo.com/question/index?qid=20070924151635AAlfrUM

To be legally blind, you have to have 20/200 or worse vision with the best possible correction. I have -16.00 glasses that correct me to 20/30 so I'm far from being legally blind. Your vision is just fine. Converting an eye prescription to 20/x is not an exact science, but your vision without the contacts is probably around 20/600.

www.iblindness.org/3564/converting-vision-between-diopters...

So if you can read the 40 line, your vision is 20/40, and a person with good vision should be able to read that line from 40 feet away, while you have to get up to 20 feet to barely read it. As you may be learning at this point, this is all pretty rough, despite those convincing looking decimal points in a prescription like -4.25.

www.medhelp.org/posts/Eye-Care/How-do-the-numbers-20...

How do the numbers 20/? relate to my prescription? ... then, is, in terms of 20/20, what would I be? 20/? Seeing as a prescription around -4 matches up to something like 20/600, am I like, 20/five million? ... I forgot to add that legal blindness is always determined as the best vision in a corrected eye, which must be 20/200 or worse, and/or ...

discoveryeye.org/understanding-your-eyeglass-prescription

If you can read the fourth line from the bottom of most charts, you vision is 20/20. Any line below that would be 20/15 or below and indicates that you have exceptional visual acuity. Each eye is tested separately as your eyes are designed to compensate for each other and would not give an accurate reading. Understanding Your Eyeglass Prescription

www.lenscrafters.com/lc-us/vision-guide/glasses-prescription

SPH(or Sphere) indicates the eyeglass prescription power, or how strong your lenses need to be to correct your vision.For an indicator of how much magnifying power is needed in a bifocal or progressive lens to correct your vision problems, look for ADD. CYL (or Cylinder) indicates astigmatism, a condition where the cornea is irregularly shaped causing blurred or distorted vision.

www.improve-vision-naturally.com/.../what-is-2020-vision.html

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.

www.reddingmedical.com/documents/Spot VS100 Vision Screener...

Conversion Chart Refractive State to “estimated” Visual Acuity >Example 1 >DS Result in minus (-), use “myopia” columns >Myopia conversions are for all ages >Conversion for this example indicates an “estimated” visual acuity of 20/60 (OD) and 20/60 (OS) >Example 2 >DS Result in plus (+), use “hyperopia” columns

www.ign.com/boards/threads/whats-the-worst-vision-that...

I have 20/400 vision ATM with a possibility of it getting worse to 20/600 ish or even worse. Can LASIK get me down to 20/200 or less?

www.quora.com/How-bad-is-my-eyesight-My-prescription-is...

How bad is my eyesight? My prescription is 500/700. Update Cancel. ... Your prescription cannot be described in terms of 20/XX vision. The spectacle prescription is denoted in 'diopters', while visual acuity is denoted in Snellen notation eg 20/20. ... ask the optician what your best corrected vision is, usually 20/xx or 6/xx.