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High definition - HD sunglasses with bifocals are available from +1.50, +2.00, +2.50 or +3.00 reading power magnification. HD lens sunglasses filter out the blue light in the UV spectrum, which causes haziness; leaving a clearer and crisper view. HD vision, also called Blue Blocking lens is great for all outdoor activities including cycling, tennis, baseball, fishing, biking, running, golfing, running, hiking, motorcycle riding, walking and driving. HD bifocal glasses provide high color contrast and reduce eye strain as well. ASIN Z87.1 safety lenses with UV 100 protection protect your eyes from all hazardous elements. Full wraparound frames block the UV rays, wind, dust and debris. Integrated rubber ear pieces prevent slippage and provide comfortable fit. Although perfect for men, the Puma is a slightly smaller frame; and one of our most popular bi-focal readers for ladies. Fits SMALL to MEDIUM head sizes.