American Board of Ophthalmology (ABO) Practice Exam

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Prepare for the American Board of Ophthalmology Exam with expert resources. Utilize flashcards and multiple-choice questions with hints and explanations to excel in your exam.

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Which frame material is known for resisting stretching under heat?

Metal
Nylon
Acetate
Wood

The correct answer is: Nylon

Nylon is known for its excellent resistance to stretching and deformation under heat. This thermoplastic material has a high melting point and is less likely to lose its shape or integrity when exposed to higher temperatures compared to other frame materials. Nylon's ability to maintain its structural integrity makes it ideal for eyewear that may be subject to varying environmental conditions, including heat exposure. When it comes to other materials, metal frames, while being durable, may conduct heat and potentially lose shape under excessive temperatures. Acetate, though flexible and lightweight, can deform when subjected to high heat, making it less stable in these conditions. Wood frames can also warp or crack when exposed to heat and moisture, making them less suitable in situations where resistance to heat distortion is required. Overall, the inherent properties of nylon make it the material of choice for applications where resistance to stretching and shape retention under heat are crucial.