Sunlight and blue light are beneficial for vision and can help offset myopia, provided the blue light is not excessively bright or too close to the eyes.

“Why? It can offset myopia (near-sightedness) & development of myopia. How? Still unclear but it’s likely sunlight and far-viewing combined.”

“Several large scale studies indicate that spending time outdoors can offset the development of (and perhaps also partially reverse), myopia (near-sightedness).”

“So, try and get outside, it's really the sunlight and the blue light, right? Everyone's been demonizing blue light out there, but blue light is great provided it's not super, super bright and really close to your eyes. Blue is terrific if it comes from sunlight.”