Thickness greater than 3.0 mm could indicate what kind of lenses?

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Prepare for the Ophthalmic Optics Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Thickness greater than 3.0 mm could indicate what kind of lenses?

Explanation:
Thicker lenses, especially a center thickness over about 3 mm, are a telltale sign of safety eyewear designed to meets impact-resistance standards. Those safety requirements apply regardless of the material, so you can have basic impact safety lenses made from glass, plastic, or acrylic. High-index plastics are usually chosen to keep lenses thinner for regular use, not to satisfy safety thickness, so the thickness cue points to safety lenses from any material rather than to a specific material.

Thicker lenses, especially a center thickness over about 3 mm, are a telltale sign of safety eyewear designed to meets impact-resistance standards. Those safety requirements apply regardless of the material, so you can have basic impact safety lenses made from glass, plastic, or acrylic. High-index plastics are usually chosen to keep lenses thinner for regular use, not to satisfy safety thickness, so the thickness cue points to safety lenses from any material rather than to a specific material.

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