The Blue light is a light that comes from the sun. It is a mix of all colors, red, orange, green, blue, yellow, indigo and violet. When the colors are combined, they become the white light that we can see. All of the colors have different energy and wavelengths.
The largest source from Blue light is found in the LED light used for creating computers, TVs, smartphones, and so on. And the more you use your computer or smartphone without protection, the more chances you have of developing eye disease.