The blue light exposure you receive from screens is small compared to the amount of exposure from the sun. Nevertheless, there is concern over long-term effects of screen exposure because of the close proximity of the screens and the length of time spent looking at them. According to a recent NEI-funded* study, children’s eyes absorb more blue light from digital device screens than adults.
When you stare at a screen for hours at a time, whether it is a computer, TV, phone or tablet, you are exposed to blue light from the device. The discomfort some people have after looking at screens is most likely digital eyestrain. Most of us blink less when looking at screens, causing eye strain and dry eye.
Blue light also affects the body’s circadian rhythm, our natural wake and sleep cycle. During the day, blue light wakes us up and stimulates us. But too much blue light exposure late at night from your phone, tablet or computer can make it harder to get to sleep.
* National Eye Institute