http://www.heavyglare.com/optical-glossary.html
Ich glaube, dass normale Sonnenbrille 2-base sind, was bedeutet, dass sie ganz wenig nach aussen gekrümt sind. Sportbrille sind wegen Windgeschwindigkeit (fahrel, laufen...) aber mehr nach aussen gekrümt, damit dieses Effekt erzogen wird:
Windless Eyewear: will enclose and seal your eyes from the elements. Venting of the lenses allows slight airflow to keep the lenses from fogging and keeping your eyes from excessive wind irritation (great if you wear contacts). These glasses come with 100% UV protection along with diverting wind, dirt or snow. Checkout our Windless Eyewear. Sunglasses by PanOptx
Wrap Sunglasses : Wrap sunglasses are those that curve around the curve of a person's face fitting close to the head. These wrap sunglasses are normally 8-12 Base Curve.