Most of us can not go for more than an hour without looking at our smart phones or tablets and we spend much of the day working at a computer. All of these devices emit blue light, linked to everything from eye strain and retina damage to sleeping problems. So as an adult, when we look at our phones at 12 inches and now a child looks at their phone at six inches, it's not twice as much emitted, it's 4 times.there is a solution that doesn't involve giving up your electronic devices, BluTech lenses. They contain pigments that filter high-energy blue and ultra-violet light.The headaches ceased immediately which was wonderful,and eyes don't tear anymore, and you will not feel as tired as before and will sleep better. it actually relaxes your eyes, it eliminates that eye strain and more importantly, it doesn't let that wavelength of light enter into your eye.The BluTech lenses come with almost any prescription and are also available in non-prescription form.