Liverpool's classic square aviator style reading sun readers feature a durable high nickel metal frame with a full magnified reading lens. The flexible spring hinges help maintain the original shape for a comfortable fit every time you wear them. These tinted reading sunglasses are equipped with impact resistant Polycarbonate lenses that provide 100% protection from the sun's UV rays, making it perfect for reading in outdoor or sunny areas. Liverpool reading sun glasses are available in black/gunmetal frame with smoke lenses or tortoise/bronze frame with brown lenses, in the following powers: +1.00 +1.25, +1.50, +1.75, +2.00, +2.25, +2.50, +2.75, +3.00, +3.25.+3.50 and +4.00. Lens Width 53mm; Bridge Width 21mm; Temple Length 133mm; Lens Height 33mm; Frame Width 135mm. Fits small to medium head sizes. WHOLE Lens is READERS. This style is NOT bifocal.