Working overtime and staying up until 2 or 3 a.m. has become the normal lifestyle rhythm for today’s post-90s and post-00s generations. Your eyes are clearly exhausted, yet you just can’t tear yourself away from the tablet or put down the phone—why is that?
The truth is out! It turns out to be “blue light damage”—our brains are being tricked by our eyes. Let us introduce you to the invisible vision killer: “blue light.”
Question 1: What is blue light?
Blue light refers to light with wavelengths between 400nm and 480nm that carries relatively high energy. Blue light within this wavelength range can increase the toxin levels in the macular area of the eye, posing a serious threat to our retinal health.
Question 2: What are the hazards of blue light?
Not all blue light bands are harmful to the human eye. Blue light between 400 and 440 nanometers is considered harmful blue light, while blue light between 480 and 500 nanometers plays a role in regulating biological rhythms—sleep, mood, memory, and more are related to it, making it actually beneficial to the human body.
The damage blue light causes to the eyes is related to the duration and intensity of exposure. When the illuminance and exposure time exceed 2 hours, it can cause damage to the retina.
Question 3: What is the relationship between blue light and staying up late?
Blue light is everywhere in daily life, but harmful blue light comes from computer monitors, fluorescent lamps, mobile phones, digital products, display screens, LED lights, and other sources.
Blue light suppresses the secretion of melatonin, an important hormone that affects sleep. Its known functions include promoting sleep and regulating circadian rhythms. This explains why playing with your phone or tablet before bed leads to poor sleep quality or even difficulty falling asleep—the later you stay up, the harder it becomes to sleep.
This ultimately leads to eye fatigue, continuously deepening prescription glasses, poor nighttime sleep quality causing inability to concentrate on work during the day or focus on studying, seriously impacting our lives.
In the long run, blue light damage may let you experience the “joy” of staying up late, but it will also make you experience the tragedy of super thick lenses.
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