The base curve is the front curve of any sunglass lens. Sunglasses typically feature base curves between 6 and 9 measured curvatures. Sunglass models that feature a 6 base tend to be more flat relative to the front of the frame. While 9 base styles provide the maximum amount of wrap around your face. Base curves above 8 are not recommended for prescription lenses and the higher the Rx; the flatter the frame is advised. Many sunglasses replicate the look of an 8 base curve with larger temples to help block light coming in from the sides.
Answered on 5/2/2013 3:01:19 PM by Product Specialist Kevin from Sierra Trading Post