TIJN Vintage Square Progressive Multifocus Reading Glasses Anti Blue Light For Women Men Nerd Eyeglasses ReadersProductLens Width: 53mmFrame Length: 140mmBridge Width: 18mmDiopter available: +150 +200 +250 +300 Color: black transparent marble please choose your normal reading glasses power magnification and frame color when pay for it.Progressive multifocus reading glasses feature three power grades to meet all your need.3 levels of vision:- Bottom Level: for near distance used, such as reading, writing, etc.- Middle Level: for working on your computer, watching TV or other digital screens.- Top Level: for long distance viewing such as walking, shopping, driving and more.tips for wearing: - Most people wear progressive multifocus glasses need about a week of adaptation, but the adaptation period varies from person to person. Beginning to wear may be a little uncomfortable, you can adjust the time of wearing glasses every day according to your actual situation.- Since the sides of the lens are astigmatic disorder district, you need to turn around the neck and eyes in order to see objects on your both sides clearly. -When go down stairs, please lower your glasses and use the top area. Tips for keeping:-The glasses should be treated carefully to avoid damage and cleaned regularly.-Clean the lens using soap water or neutral detergent, gently wipe dry with the soft glasses cloth included.-Do not expose glasses to high temperatures or damp environments in a long term.30 days quality guarantee. If there are any problems, please contact us in time.