Two noticeable differences between New Wayfarer & Original Wayfarer are the size of the lenses and the shape of the frames. Renewed Wayfarer has a slightly wider lens, whereas Original Wayfarer usually has a bit shorter lens height. Lens heights may vary depending on which year model is in question.
Ray-Ban Wayfarers are designed to be unisex. Modern frames are overall smaller, and the shape is less angular. In turn, originals are somewhat heavier and bulkier, which gives them a distinct classic retro-look.