Polycarbonate lenses Reduce digital eye strain - Minimize eye fatigue, blurred vision, and headaches during screen use. Blocks blue light - Filters 90 percent of blue light to relieve eye fatigue, dryness, and vision decline. Promotes better sleep - Reduces eye strain and headaches for deeper rest. Material - Frame: TR90 Lens: Polycarbonate (non-prescription). Lifetime warranty - Includes worry-free coverage and dedicated customer support. Why filter blue light Digital screens (TVs, tablets, computers, phones) emit harmful blue-violet light. These glasses limit blue light exposure for more comfortable screen time. Symptoms of digital eye strain: Headaches, tired eyes, and neck stiffness. Prolonged screen use strains eyes and accelerates aging. Our glasses filter harmful blue light for improved comfort and reduced eye strain.