Exchange/Warranty - Unfit or wrong glasses can be exchanged or refunded within 30 days of receiving. Customers will enjoy 90-day warranty, covering any possible defect in materials and workmanship. Stylish Design - Keeping up to date with the latest trends, Firmoo offer this fashionable Small Round Metal Frame. A good partner for working in front of computer. Never let glasses being an embarrassment, you should be standing out every day. High Quality Frame - Known for being strong, lightweight, and flexible. Metal frame is comfortable to wear. The frame comes with adjustable nose pads. Magnification - These glasses are +3.00 magnification. Your reader magnification/power depends on how far you are from the screen you are viewing. For a laptop or desktop (19+ inches away) select a magnification 2/3 your normal reading power. (eg:Your normal power is +3.00, then choose +2.00 for this case) For a smartphone, tablet or a book about select your normal reading power. Firmoo Blue light Blocking Lens - Effectively block 380nm~455nm harmful blue-light from computer, phone, iPad, etc, relieving visual fatigue.