There is a lot of hype on Facebook at the moment about blue light blocking lenses. So I thought I would clarify a few key points here:
- There is a difference between “Blue light” and “UV”
- We need natural blue light for our normal functioning
- Yes excessive “UV” exposure can lead to macula damage
- There is some evidence to suggest that long exposure to “blue light” and “UV” could potentially disrupt sleep patterns
- Computer screens and digital devices emit significantly lower levels of blue light than what you would be exposed to by being in natural sunlight
- Yes there are blue light blocking lenses (yes some are better than others)
- Almost all “Blue Blocking” lenses are only 10-15% effective at best in the critical range 446–483 mm
- We need to protect ourselves from excessive and high exposure to UV (Sunglasses, sunscreen)
- There is insufficient evidence to support the additional cost of expensive specific “blue filtering” lenses
So the best advice at the moment is to use your “night mode” function on your digital device two to three hours before bed time just in case. Make sure your glasses are “UV” protective, and if you do spend excessive amounts of time in front of a screen come and talk to us.
For more detailed information call 02 4284 1344 or pop in for a chat.