"20/20 vision" is a term for visual acuity. The Numerator (the top of the fraction) refers to distance and the Denominator (the bottom of the fraction) refers to size. Since the standard distance of the chart is 20 feet which is equivalent to 6 meters the term 2020 Vision or Vision 2020 refers to the ability to see a certain size letter at a certain distance from the eye. In this case a size 20 Letter at 20 feet. The term ""6/6 vision"" is used as the meter equivalent.

What I was saying was that this seems like an overly complex means of describing one's eyesight. This is in itself evident by the fact that most people know what 20/20 means but they do not know what 20/10 means or any other configuration.

It also seems rather selective that it ended up being 2020, as it could have just as easily been 30/30. For this phrase and way of measuring to arise a few decades before the year 2020, which is at a time when many are expecting the apocalypse to occur, seems to me to be a tiny bit coincidental.

As I said, it is not a claim that this means shit is going down on the 6th of June 20/20. You asked if I have any idea about when, and this is the only idea I have. But, it is one that, as I said, I place very little faith in, and less so in light of you not even being familiar with the phrase.