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Its a scare story that the optician have been putting about, to get us to pay for something we don't need.
Blue light is given off by screens in our phones and computers, and it was alleged that this was harmful, causing long-term damage to the eyes, tiredness, headaches and even age related macular degeneration.
The program produced two leading experts that showed that the amount of blue light that these devices gave off was very, very small indeed, and that it didn't involve any risk whatsoever.
But the opticians quoted refused to accept this.