What is blue light exactly?
Blue light (380-500 nm) is the most energetic portion of the visible spectrum. It regulates our biological clock but is also massively emitted by the LED screens of our devices. The problem? We use these screens in the evening when our brain should be preparing the body for sleep.
The proven effects of harmful blue light
On sleep
Exposure to blue light in the evening reduces melatonin production by 50%, the sleep hormone. The result: difficulty falling asleep, fragmented sleep, chronic fatigue.
On eye strain
High-energy blue light causes scattering in the eye, forcing the ciliary muscles to work harder. This is known as computer vision syndrome (CVS).
On the retina in the long term
Research suggests that prolonged exposure could increase the risk of AMD (age-related macular degeneration).
What blue light blocking glasses do
Quality glasses selectively filter harmful wavelengths (400-450 nm) while allowing useful light to pass through. The best ones are certified TÜV Rheinland or UV400.
Joey Cyan blue light blocking glasses
- TÜV Rheinland certified for their filtering effectiveness
- Compatible with prescription optical correction
- Reimbursable by your health insurance or CMU-C with anti-reflective coating included
- Available in photochromic version (adapts to brightness)
Our tips to make the most of them
- Wear them from morning: blue light strains the eyes throughout the day
- Also activate the night mode on your devices for double protection
- Consult an optician to adjust your prescription if necessary
- Combine them with the 20-20-20 rule for optimal visual comfort
