Blue light has a specific function, just like every other colour of light. Blue light rays vary greatly in their usefulness (during the day) and hazard depending on their fluctuating wavelength. The most hazardous blue light is that with the shortest wavelength since it has the maximum energy. The hazard of blue light decreases with increasing wavelength, though.
In particular, blue light rays with wavelengths of 450 nm or less are thought to be extremely dangerous, but those with wavelengths of 470 nm to 500 nm are thought to be beneficial throughout the day. Melatonin, a hormone that controls the body’s sleep-wake cycle, is produced with the aid of the range of blue light that is beneficial for our brain chemistry during the day.
Our eyes and skin become damaged when we consume too much blue light, even during the daylight, frequently due to excessive usage of computer or smartphone screens. However, these negative effects increase at night, disrupting the sleep-wake cycle and causing further eye damage.
Blue light is ubiquitous, especially during the day, since it is emitted by all digital gadgets, causing a variety of symptoms such as eye strain, headaches, dry eye, weariness, and blurred vision.
Blue light causes your biological clock to malfunction. It inhibits melatonin, which tells your body when it’s time to sleep.
The most dangerous blue light is high-energy visible light (HEV), which destroys the retina and causes skin irritation. It can also cause symptoms, including eye strain and headaches. It exists in both the UV and visible light spectrums.
Blue light between 470 and 500nm is commonly referred to as “good” blue light and is effective for a variety of therapies (sleep problems, seasonal depression, and so on). However, if you are exposed to this light after sunset, i.e., in the evening, it works against you by tricking your body into believing it is daytime.
Protect yourself from harmful blue light with Ocushield® – medically-rated (FDA & MHRA) screen protectors that filter out blue light and protect your eyes and skin, and help you sleep better.
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