i've only done one flush, am preparing to do another- i got at LEAST 200 stones last time, if one counts the tiniest ones, the number would be closer to a thousand-
and my vision DEFINITELY improved after the flush- but as time has passed, this effect has slowly gone away and my vision is returning to its crappy normal state!
i think it makes sense that if a flush causes this effect temporarily, perhaps a complete flushing (however many times that takes) could make it permanent.