Metal (Eyeglass Frames)

Alloy frames come from wire and soldered joints rather than from a solid block. Monel, an alloy of nickel and copper, dominates the affordable end because it bends without cracking, solders cleanly and takes plating well. Grade 316 stainless runs thinner and springier for the same strength. Aluminum and beryllium show up occasionally, the first for lightness, the second for corrosion resistance in sweaty use. Titanium belongs to this family technically, and is sold separately here because it behaves differently enough to deserve its own guide.

Nose pads are the real advantage. Two silicone or acetate pads sit on soldered arms that an optician bends in three directions, which changes how high the frame rides, how far the lens sits from your eye, and how much weight lands on each side of your nose. No molded plastic bridge offers that. A thin rim also takes up little visual space. So a metal front can be a full rim while still reading light on the face.

Plating is where the money shows. Base alloy is coated with palladium, nickel or gold color and often sealed with lacquer. That coating wears through first at the pad arms, the bridge and behind the ears, where skin and sweat sit against it. Once the base alloy is exposed it corrodes, turning green and shedding nickel onto skin. European rules cap nickel release from items in prolonged skin contact at 0.5 micrograms per square centimeter per week, and that limit is the figure serious makers design to, so ask about it if you have ever reacted to jewelry.

Low or flat nose bridges gain most, because pads can be brought inward and downward to seat where a molded bridge simply floats. Narrow faces and anyone wanting a discreet frame do well too, and repairs are usually straightforward since most alloys can be soldered.

Squeeze the rim near the hinge and watch what it does, because good alloy springs back where soft alloy stays oval. Look closely at the solder joints for a smooth fillet instead of a blob with pits. Confirm the pads are separate arms rather than molded lumps. Dry the frame after sport, since salt left on plating is what starts the corrosion that eventually reaches your skin.