When using a lens loupe/magnifier to identify the GP lens' overall diameter, is the diameter measured indirectly or directly?

Study for the Gas Permeable Contact Lenses – Lens Anatomy, Verification, and Selection Test. Prepare with flashcards and multiple choice questions, each question includes hints and explanations. Get ready for your exam!

Multiple Choice

When using a lens loupe/magnifier to identify the GP lens' overall diameter, is the diameter measured indirectly or directly?

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