Assertion: Although the surfaces of goggles lens are curved, it does not have any power.
Reason: In case of goggles, both the curved surface has equal radii of curvature and have center of curvature on the same side. 

The surfaces of goggles are curved, however, they don’t have an optical power of their own. The reason is the perfect explanation of this statement that the curved surfaces have an equal radii of curvature thereby cancelling out each other’s effect.