The Olloclip 4-IN-1 for iPhone 4/4S and 5/5S is an attachment for the rear-facing camera. The options beyond the standard lens are 10x Macro, 15x Macro, Wide-Angle and Fisheye, and should be more than enough for the quick photo and video opportunities that life presents us. These are coated glass multi-element lenses housed in aircraft grade anodized aluminum. The attachment for the iPhone is plastic and should make a secure fit. The cost is reasonable considering the lens options you're getting, $70 for the 4-IN-1 and $100 for case options with the iPhone 4 or 5 body.
Check it out on the CES Show Floor