Which lens material offers superior impact resistance among common options?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

Which lens material offers superior impact resistance among common options?

Explanation:
Impact resistance is about how well a lens material can absorb energy from a sudden impact without cracking or shattering. Polycarbonate stands out because its tough, energy-absorbing polymer structure lets it deform and absorb a lot of impact before failing. That makes it far more resistant to breakage than the other common options: CR-39, while good optically, is comparatively more brittle; acrylic can crack with heavy impact; and glass is very brittle and shatters under impact. Because of this, polycarbonate is the material of choice when safety and durability under impact are priorities.

Impact resistance is about how well a lens material can absorb energy from a sudden impact without cracking or shattering. Polycarbonate stands out because its tough, energy-absorbing polymer structure lets it deform and absorb a lot of impact before failing. That makes it far more resistant to breakage than the other common options: CR-39, while good optically, is comparatively more brittle; acrylic can crack with heavy impact; and glass is very brittle and shatters under impact. Because of this, polycarbonate is the material of choice when safety and durability under impact are priorities.

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