What areBlue light blocking glasses? Blue light blocking glasses help reduce eye strain, fatigue and improve sleep by blocking high-frequency visible (HEV) segments of digital screens' light spectrums that emit high-frequency visible (HFV). This helps decrease eye strain, fatigue and enhance restful nights' rest. Blue light, commonly found in sunlight, plays an essential role in maintaining healthy eyesight; however, too much blue light can disrupt our natural sleep cycle and diminish production of melatonin production, leading to insomnia and depression. The SKYLINEOFFER NightFall range offers lenses that block both blue and green light to ensure maximum quality sleep quality.