@MarqFJA87 @Fuko
https://en.wikipedia.org/wiki/Visual_acuity
"A reference value above which visual acuity is considered normal is called 6/6 vision, the USC equivalent of which is 20/20 vision: At 6 meters or 20 feet, a human eye with that performance is able to separate contours that are approximately 1.75 mm apart. Vision of 6/12 corresponds to lower, vision of 6/3 to better performance. Normal individuals have an acuity of 6/4 or better (depending on age and other factors)."
"A simple and efficient way to state acuity is by solving the fraction to a decimal number. 6/6 then corresponds to an acuity (or a Visus) of 1.0."
"6/3 corresponds to 2.0, which is often attained by well-corrected healthy young subjects with binocular vision. Stating acuity as a decimal number is the standard in European countries, as required by the European norm (EN ISO 8596, previously DIN 58220)."
Added the relevant lines since I didn't know much about these international standards either.
Looks like Kyoko is blind without her glasses...good that glasses can help her that much.