<b>JESOHO Tempered Glass Screen Protector: The Best Protection For Your iPhone.</b><br><br> <b>Fit for:</b><br> For iPhone 7 Plus and iPhone 8 Plus black, 5.5 inch<br><br> <b>What is Blue Light?</b><br> In the light of the phone's screen,It contains a high-energy blue light of 450-470nm,which can go straight to the yellow spot at the base of the retina,causing serious damage to the eyes.<br><br> <b>What are the problems with blue light?</b><br> 1.Vision drop or loss.<br> 2.Eyes fatigue,dry,tingling and other phenomena.<br> 3.Visual fatigue aggravates the lesion of macular region.<br> 4.The night's screen disturbs sleep.<br><br> <b>Why you should choose Anti-Blue Light tempered glass screen protector?</b><br> Blue light sources are becoming increasingly common in today’s environment. Exposure to blue light comes from a variety of technologies including computers, smartphones, televisions, and lights.<br> Blue light exposure has been shown to impact health. Natural exposure to blue light during the daylight hours boosts people's energy, alertness and mood. However, elongated exposure to the waves transmitted through screen devices during the evening can disrupt circadian rhythm and cause various health effects including a disruption in normal sleep schedules.<br> It is possible that chronic daily exposure to blue LEDs could pose similar ocular risks to humans . Additionally, the severity of retinal damage has also been shown to vary by time of day.