The lenses correct for colorblindness by blocking out a portion of light in the color spectrum, thus changing the way our eyes perceive colors, and allowing those with color blindness to distinguish hues and experience the world almost like someone with normal vision.
Scott describes his own colorblindness in the video saying, “It doesn’t mean that I see the world in black and white, it just means that I see things in a way that are a little bit more dull than usual. I can see some pink and some green. It’s just sometimes green looks brown or yellow and pink looks silver or blue.”
Scott doesn’t know what the glasses are when he puts them on, which makes his reaction to his new technicolor surroundings all that more fun to watch. (His reaction to purple in particular will make you appreciate the shade in a way you never have before.) And that’s all before he even goes outside.