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You will probably have seen that most blue light blocking glasses have clear lenses whilst some have orange lenses. What's that about? Put simply: clear lenses block small amounts of blue light during the day to help prevent eye-strain, headaches and a feeling of being "wired". Wear these if you're on a screen for a long time or in poor quality lighting such as fluorescent lights.  Orange lenses on the other hand should be worn before bed. Blue light signals to your body that it's daylight and therefore the body does not need to produce the sleep hormone, melatonin. Zees orange lenses stop over 99.9% of the blue and green light which allows your body to naturally produce melatonin which...

By Olivia Arezzolo. As a sleep expert with over 9 years of academic studies, I’m continually asked - does blocking blue light actually work to improve sleep? Short answer: yes. Long answer: yes, and I have countless studies to back this up. A meta-analysis of no less than 15 scientific studies found blue light, particularly in the 2 hours before bed, suppresses melatonin. As the key hormone to make you sleepy, this means unless you’re blocking blue light, you wont become sleepy as you should - and instead, find yourself wide awake, even in the late evening. And if you think it’s just about your phone or TV - it’s not. Blue light is emitted from regular lighting too -...