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SCAGLIA Progressive Blue Cut Reading Glasses for men and women contains progressive lenses with blue light blocking function. One pair of Progressive lenses has three prescriptions. That means you don't have to change your glasses to do close-up work like reading a book, middle-distance work like looking at a website on a computer, or distance viewing like driving. They are often referred to as multifocal lenses. You won't need to carry more than one pair of glasses with you if you use progressive lenses. You don't have to switch between reading and ordinary glasses. Vision with progressives might appear to be natural. When you move from seeing up close to looking far away, you won't notice a "jump" as you would with bifocals or trifocals. So, when driving, you may gaze at your dashboard, the road, or a distant sign with a smooth transition. They appear to be ordinary spectacles.Blue Cut Lens Protect your eyes from blu-ray, filter hazardous radiation from computer gaming, video games, phone, or TV, and aid in the reduction of eye strain, blurred vision, headaches, and sleep disruption.