All around us are devices that emit blue light. Think of smartphones, computers and the television. Every time your child - or you yourself - uses a screen, it means exposure to blue light.
This exposure can cause symptoms such as burning and tired eyes, headaches and difficulty falling asleep. Exactly how much blue light affects our eye health is still being studied.
What we do know for sure is that blue light has a negative effect on sleep. This is because it inhibits the production of the sleep hormone melatonin. Read more here.