I just got a pair the day before yesterday and experienced a drop on the spot. After trying it on for 20 minutes, my naked eye vision improved by 2 lines. Refraction results: left eye 175 degree myopia, combined with 100 degree astigmatism, right eye 400 degree myopia, expecting the effect. I am 36 years old, and I said that teenagers will have better effects, and adults will have different effects according to individual differences. I'll wear it for a while before posting it.