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ABO NOCE Basic Opticianry

Category - Ophthalmic Optics

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What is the vision range in the intermediary zone of the trifocal?

12 to 36 inches
18 to 24 mm
10 to 18 inches
18 to 24 inches

Explanation

Answer: D - The vision range in the intermediary zone or mid-range is defined as 18-24 inches.

Beyond 24 inches is considered distance range and 0-18 inches is defined as close range.

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