RX1970V is Ray-Ban's prescription version of the 1970, and its oval metal front takes 140mm metal arms curved to follow that oval line. This aftermarket set matches the curve and length, so it seats into the prescription front the same way the factory temple did, without the straighter bend used on Ray-Ban's square eyeglass frames. Because the sunglasses-only RB1970 shares the same oval shape and arm length, checking for the RX prefix before ordering is what confirms you're getting the prescription version.

Eyeglasses get more all-day wear than sunglasses, so hinge fatigue tends to show up sooner on frames like the 1970V — usually as arms that won't hold an angle rather than visible damage. A replacement arm is the simpler fix when the lenses and prescription are still current and only the metal temple has loosened or bent. A hinge that feels stiff right after fitting typically loosens to a comfortable action within the first week of regular wear.