Looking for Chinese Eye Chart, Please Help!?

Question

Can any one please tell me; What would be the American equivalent number translation (ie. 20/20) for a person with 0.2 on a Chinese eye chart?

this is my mom's question, not mine =)

Answer 1

Finding a chart isn't easy: Chinese characters do not lend themselves to the equvalent of a Snellen chart, (being of nothing like equal visibility. Latin characters have the same problem to a lesser degree: there's much more difference between an H and an O than an O and a D. Landolt "C"'s and Tumbling "E"'s are both international and more reliable)

But converting the VA is easy.
20/20 should be treated as a fraction =1
so 0.2 = 2/10 = 20/100

The reason 20/20 or any other acuity is not is simply reduced to a single figure, apart from habit, is that it preserves information about the distance at which the test was done: usually but not always 20 ft (6 metres in Europe, hence 6/6)

Someone shortsighted, with 20/200, might have 3/3! Vision 0.1, or 1!

Answer 2

Not really sure. I am trying to find it myself. My eye sight was about 0.2
from Chinese old chart around 1975 until recently when people use a different chart.

For the old Chinese chart, the regular eye sight is 1.5. You should use that chart in a distance of 5 meters (I guess), which is much shorter than the 20 feet in US. So, 20/20 is 1.5. 0.2 should be 0.2/1.5=20/150.

That is what I guess and is comparable with my eye sights.
I hope that this might help.