Metal Frame Materials
In the past, gold-containing alloys were the more predominant metals used for spectacle frames. Gold Classifications for Metal Frames with Substantial Gold Content.
Today few frames contain any gold.Great progress has been made in metal frames because of the electrolytic treatment techniques, which allow for corrosion resistance and finished beauty.
Any nostalgia over the disappearance of gold alloy frames from the marketplace should be dispelled by the beauty and serviceability of the product that has taken its place.
It is also common for frames to be made with more than one material. The temples may be from one material for flexibility, the frame front from another, and the connecting pieces something different still.
Nickel-Based Materials
Nickel is a material that is often used for eyeglass frames.
It is strong and malleable.
The main disadvantage is the number of people who may have an allergic reaction to nickel.
It is reported that 10% of the population may be allergic to nickel.
Fortunately high-quality ophthalmic frames are coated with a protective material that both prevents corrosion and keeps the metal from coming in direct contact with the skin while the coating remains on the frame.
Pure Nickel.
Nickel resists corrosion. Because of malleability, pure nickel frames are easily adjusted.
Nickel’s characteristic of accepting color well makes these frames versatile.
OPTOMETRY-SHARP VISION
Optometrist