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. But is the blue light from too much screen time blinding us? There is no scientific evidence that blue light from digital devices causes damage to your eye.
Why Do My Eyes Hurt When Staring At A Screen?
The discomfort some people have after looking at screens is most likely digital eye strain. Most of us blink less when looking at screens, causing eye strain and dry eyes. The good news is eye strain does not cause lasting damage and is easily preventable.
The best way to protect your eyes against eye strain is to take regular breaks using the “20-20-20” rule: every 20 minutes, shift your eyes to look at an object at least 20 feet away for at least 20 seconds. You can also use artificial tears to refresh your eyes when they feel dry.
Skip the glasses that claim to protect your eyes against blue light, because of a lack of evidence that they are effective. No ophthalmology societies recommend any special blue-light-blocking eyewear for computer use.
Blue Light Can Keep You From Falling Asleep
Blue light does affect the body’s circadian rhythm, our natural wake, and our 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.
That is why we recommend that you try to limit your screen time to two to three hours before you go to bed. You can also try night time settings on your devices to minimize blue light exposure in the evenings.
Did You Know? You Get More Blue Light Exposure From The Sun Than Your Screens
Although people often associate blue light with computers and phones, the largest source of blue light is sunlight. Other sources include fluorescent light, compact fluorescent light bulbs, and LED light. Blue light exposure from screens is much less than the amount of exposure from the sun. It’s also no more damaging than blue light from the sun.
Too much exposure to ultraviolet light from the sun increases the risks of eye diseases, including cataracts, growths on the eye, and cancer. We know less about blue light. Its effects are still being researched.
Some studies suggest that not enough exposure to sunlight in children could affect the growth and development of their vision. Not getting enough sun could also increase the risk of myopia (nearsightedness) in teens and young adults, a recent study suggests.
The bottom line is that taking preventive measures against blue light even though there is no evidence of damage could be more harmful than the blue light itself. It’s premature to take preventative action against blue light—there could be unintended consequences.