About LianSan LianSan glasses brand, originated from China, is a global eyewear brand with striking sales growth.LianSan is focused on becoming a well-deserved vision specialist. These products with stable optical performance, reliable quality, beautiful appearance and high performance gain market trust and high praise. LianSan glasses can be divided into "eternal classic" series,"fashion rebellious" series,"outdoor leisure" series and "reading" series. Due to LianSan glasses' excellent performance on the quality, they has been favored by several China's most outstanding professional ophthalmic hospitals and were designated as recommended glasses brand. What is Progressive Multifocus Reading Glasses? Progressive multifocus reading glasses are used to correct the problem of presbyopia in middle-aged and elderly people. The realization of the long-range, medium-distance and close-range spatial visual functions under central gaze conditions ,we change the curvature of the lens from top to bottom, adding positive diopter, which result in the effect of visual correction. It means you can wear the glasses anytime and anywhere like optical glasses. Tips : As the two sides of the lens is astigmatism disorder district , you need to turn around the head and eyes in order to see objects on your both sides clearly. If you squint these areas may cause distortion of your line of sight,you will feel discomfort. Optical-grade Resin Blue Light Filter Lens Light Weight Tortoise Plastic Frame Durable Metal Firm Hinge Read more LianSan blue light blocking lens can effectively block harmful ultraviolet radiation and reduce the damage caused by harmful blue light. It can eliminate glare and improve contrast, then optimizing vision acuity clarity with fewer distractions. Relieving your eye strains and headache when watch TV or look at smartphones.