2.What are the common sources of blue light each day ?

At first is sun shine. But the sun is far to our earth,we only catch a bit each day,that 's no worry!

But, the global economic stronger year by year.

Now people life always with electronic products,such as

TV screens, desktop computers, laptops, tablets, e-readers, smartphones, video games, LEDs, and fluorescent lights all emit artificial blue light. The amount is minimal in comparison to the output found in sunlight. Despite that, the exposure is still significant. That's due to the widespread use of these electronics, the excessive amount of time spent using them, and their proximity to your eyes during use.

the blue light more caused the child and baby when touch them too much each day.so the people eyes harmful case go younger and smaller than before.

We really hope everyone take a blue blocked frames to blocked the blue light which will be harmful you and your children.