American Board of Ophthalmology (ABO) Practice Exam

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Which frame material is noted for being lightweight and strong?

Wood
Plastic
Resin
Metal

The correct answer is: Metal

Metal is noted for being lightweight and strong, making it a popular choice for eyewear frames. Various types of metal, such as titanium and stainless steel, are used in the manufacture of eyeglass frames due to their excellent strength-to-weight ratios. This allows for a durable frame that does not add unnecessary bulk to the eyewear, providing comfort for the wearer. While plastic frames can also be lightweight, they generally do not match the strength offered by metal options. Similarly, resin can have good strength characteristics but is often heavier than some metal options. Wood, though it can be lightweight, typically lacks the strength required to withstand everyday wear and stress associated with eyewear. Therefore, metal stands out as the preferable material when the balance of weight and strength is crucial in frame design.