Natural sunlight contains a lot of blue and UV light. Other sources include artificial light and electronic devices that use LED or plasma flats screens, for example, PC’s, laptops, smart phones, tablets, video games and virtual reality glasses.
Because children are increasingly using electronic devices, there is a increasing concern this could be causing subtle eye damage, which leads to problems like short sightedness. In one study, exposure of eyes to more blue light than red light caused a slight size change in eye size, similar to what happens when eyes become short-sighted .
The eye is also used to more blue light during daylight hours, and less at night. The day/night cycle in the body is tuned in to how much blue daylight the eyes get . So, exposing the eyes to more blue light at the end of the day tricks the body into thinking the day is longer. This can lead to sleep problems, which in children causes delays in cognitive development and the ability of the eyes to repair. And as we know, children sleep longer than adults.