Type: Progreive Multifocal Reading Glae Style: Fashion, Claic Lens Material: Resin Lens Technology: Blue Light Blocking, Progreive Multifocu Magnification Strength: Strength 1.0x ~ 4.0x Frame Material: PC Color: Black, Black-Red -What are progreive multifocal reading glaes? Asymptotic multifocal glaes are the upper optical area of the lens used to look far and the lower optical area used to look near. The degree of the middle gradually change, which is used to look at the intermediate area. Most people who wear progreive multifocal glaes need about a week of adaptation, but the adaptation period varies from person to person; they walk slower when they feel dizzy. When going downstairs, please lower your glaes and use the top area. You'll feel safe and comfortable. Product Size: Total Width: 137mm (5.39inch) Frame Width: 52mm (2.05inch) Frame Height: 42mm (1.65inch) Nose Bridge Width: 16mm (0.63inch) Temples Length: 135mm (5.31inch) Weight: 21.6g (0.76oz) Package Included: 1 x Reading Glae Note: 1. There is a 2-3% difference according to manual measurement. Please check the size carefully before you buy the item. 2. Please note that a slight color difference should be acceptable due to the light and screen.