Education

Woman wearing yellow-tinted blue light glasses working at a laptop in warm natural light
Blue Light and Cortisol: What Your Screen Is Doing to Your Stress Response
Blue light activates a cortisol stress response in your nervous system. Here's the mechanism, what it means across a full screen day, and how to reduce the load. Read more...
Close-up macro photograph of a human eye in warm natural light, representing the impact of screen exposure on eye health
Why Screens Cause Dry Eyes: The Two Mechanisms Nobody Is Talking About
Screen time causes dry eyes in two ways. Most advice addresses one. Here's the mechanism nobody is explaining, and why filtering blue light changes the outcome. Read more...
Diagram showing how a yellow-tinted lens filters blue, indigo, and violet light wavelengths while allowing red, orange, yellow, and green wavelengths to pass through to the eye
Do Blue Light Glasses Work? Why the Tint Is Everything
Most blue light glasses don't work. Research confirms it. Here's why the lens type matters more than the brand, and what the science says to look for instead. Read more...
Blue Light and Melatonin: What the Science Actually Says
Blue Light and Melatonin: What the Science Actually Says
Blue light does not cause poor sleep. It delays it. That distinction matters more than most people realise, because the mechanism is biological, not behavioural, and understanding it changes what... Read more...
What Is Circadian Rhythm?
What Is Circadian Rhythm?
Discover how your body’s internal 24-hour clock governs sleep, energy, hormones, and focus—and why modern light exposure may be throwing it off. Learn the science behind circadian rhythm and how... Read more...