LAMBBAA Progressive Multifocal Presbyopic, Anti-Blu Light Readers in a Clear Blue; 3.25 Magnification [DIMENSIONS: Lens Width - 52MM Bridge Width - 18MM Arm length - 142MM • Blu Light Blocking Lenses can effectively block harmful ultraviolet radiation and reduce the damage caused by harmful blue light. The yellow tinted lens can improve contrast, then optimizing vision acuity clarity with fewer distractions. Relieving your eye strains and headache when watch TV or look at smartphones. Three Levels of Vision - Progressive multifocus glasses for all your needs. • Top Section is half-power magnification for walking, shopping. • The Middle Section is slightly reduced power magnification for working on computer, watching TV, etc. • The Bottom Section of the lens is full-power magnification, then used for nearly distance reading. It means that you can wear the glasses anytime and anywhere.