Sunlight or white light contains red, orange, yellow, green, blue, indigo, and violet light, as well as infinite shades of each. Every color has a unique wavelength and energy or electromagnetic radiation. Light rays on the red end of the visible light spectrum have longer wavelengths and emanate less energy. On the opposite end, blue light rays have shorter wavelengths and radiate more energy. When the light rays on the blue end of the light spectrum bounce on water and air molecules in the atmosphere, they scatter more easily than other light rays with longer wavelengths. This is why we see a cloudless sky as blue. About one-third of all visible light is blue light.

           The American Optometric Association asserts that blue light has a significant impact on wakefulness and alertness. Blue light stimulates certain photosensitive cells within the retina that influence the circadian rhythm. This stimulation is beneficial to promote alertness in the daytime, but it inhibits the onset of sleep at bedtime. As daylight wanes, the pineal gland releases melatonin, the sleep hormone. However, high-energy blue light inhibits melatonin production, thereby diminishing sleep quantity and quality. Sleep deprivation is increasing along with the use of electronic devices, wreaking havoc on many bodies and minds.

       The circadian system is integral to vital physiological functions beyond the sleep-wake cycle. It is responsible for behavioral processes that affect mood. One of the dangers of blue light is how it confuses the circadian clock, with troubling results. Scientists are now investigating a suspected correlation between circadian rhythm imbalance and mental illnesses.

        Another side effect is digital eye strain (DES), which experts refer to as computer vision syndrome or vision fatigue, affects at least half of computer users. Symptoms include those related to accommodative vision stress and dry eye. Since blue light scatters so easily, it reduces contrast and makes focusing more difficult. Thus, prolonged exposure can lead to DES.

       Our eyes endure tons of strain from the mass amounts of technology. Blue light protective glasses help filter out harmful rays that result in painful long and short term side effects helping you stay protected and safe.