YSK: Colorblindness correcting sunglasses do not instantly allow you to see more colors, they often take hours or even days of wearing to take noticeable effect. Videos of people putting them on and instantly seeing more colors are staged for marketing
from /r/YouShouldKnow
YSK：色盲矫正太阳镜并不能立即让你看到更多的颜色，它们往往需要佩戴几个小时甚至几天才能有明显的效果。人们戴上后立即看到更多颜色的视频是为了营销而上演的。