in fact, it doesn't work, any decent ophthalmologist (there aren't any) will say that these things are only needed to collect money from customers. the carrot myth isn't strong either. you can eat kilograms of carrots and poop yellow poop - your eyesight won't improve. only genetics decides. unfortunately. or fortunately. yes - your eyes get tired, but they get tired from the fact that you're looking at one point from one distance, and you need to work on your eye muscles, sometimes look into the distance, sometimes closer-farther, get distracted from the screen more often. there's another reason why your eyes get tired - you blink less when you sit at the computer, this is a proven fact. i know all these tricks because i've been working at computers since the time when they "put" a screen the size of pantyhose on monitors ))) and even put a cactus on the side so that it would supposedly absorb radioactive waves. all these tricks are complete nonsense. in fact, the eye gets tired because it looks at a static image from the same angle without blinking (almost always). if you play a game, usually 3D games, you look further-closer, because your eye thinks that the object is far away))). to preserve your vision, get distracted more often, and look out the window, even if you have a bad view outside the window, your eyes will rest from the change of work. the eye muscles must contract-expand so that the diaphragm works well. have you seen the eyes of computer scientists up close? they usually have a wide diaphragm, as if they took something in, in fact it is because the eyes are so tired that they forget to contract the diaphragm, that's all the math.