Gradient tint sunglasses have different degrees of darkness from the top to the bottom. The gradient tinted lenses usually have a dark tint at the top, and fades gradually to little or no tint at the bottom.
Gradient sunglasses are one type of sunglasses with gradient lenses. They appear dark in the top part of lenses while the button part of lenses approximates to clear. The design of the sunglasses lenses can offer well protection to eyes by blocking UV rays and reducing strong light, meanwhile offer you clear vision to read newspapers or magazines through the button part of lenses.