The most common cause of metal allergies is mercury, and this is followed by metals including nickel, cobalt, tin, palladium and chrome.Conversely, metals such as gold, titanium, silver and iron are less likely to produce allergic reactions since they rarely dissolve upon contact with perspiration or other bodily fluids.
Of the metals most likely to produce allergic reactions, nickel is the one that is most commonly used in spectacle frames. For a long time, nickel has been used in the form of an alloy as a material for spectacle frames and is also used as the base plating material for plating and gold plating, for example.
Compared with other metals, the properties of nickel make it readily dissolvable, and this means that contact of the body with nickel will result in the metal beginning to dissolve due to the effect of sodium ions in perspiration, causing an allergic reaction.
However, as a recent measure to prevent allergic reactions, the materials used in many products on the market nowadays are nickel-free. In addition, frames with vinyl-covered temples are now available for people with metal allergies.
People who may have metal allergies are recommended to undergo a patch test at a dermatologist. Forearmed with knowledge of which metals are likely to cause an allergic reaction, you will know which metals to avoid when purchasing spectacles.