Blue light also known as high-energy visible blue light (HEV) has high frequency and short wavelengths similar to UV light. Prolong exposures to blue light has shown to damage the retina, the part of the eye that detects qualities such as color and light intensity. Because your eyes are working extra hard to cope with the blue light, you begin to experience eye strain. Over sustained periods, the exposure can contribute to long-term vision issues such as cataracts and age-related macular degeneration (AMD).
At night, blue light disrupts our circadian rhythm, the natural release of hormones (melatonin). The blue light tricks our brain into believing that it is day-time, which makes falling asleep more difficult and lowers our sleep quality. Circadian disruption produces serious downstream effects including increase in obesity and depression.