Kids are more sensitive to blue light, so any potential impact could hit them harder, but another clue that blue light may not be the issue is the differing impact of interactive screen versus passive screen use. Chilling out in front of the TV, or even reading on your phone, is more relaxing than playing a video game or messaging in a group chat, even though blue light exposure is the same.
Another issue with the way we use screens is that we tend to stare intently, blinking less frequently, which can cause our eyes to dry out. Whether you call it computer vision syndrome or digital eye strain, most of us have suffered from itchy or red eyes, blurred vision, headaches, or neck or back aches at some point, usually after working on a computer. Experts continue to recommend the "20-20-20" rule: Every 20 minutes, try to look at an object at least 20 feet away for at least 20 seconds.
A whole industry has sprung from concerns about blue-light exposure. You can buy blue light-blocking glasses, filters, and special light bulbs, not to mention software options, including dark modes. But do any of them actually help, or is this just more scaremongering designed to sell snake-oil tech?
Blue light has a shorter wavelength (between 400 and 495 nanometers) than red light (620 to 750 nanometers). But different filters block different wavelengths, making them tricky to compare. Peirson says cutting off longer wavelengths can be more effective at reducing light exposure to our circadian rhythm (our natural sleep/wake cycle)
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