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Ophthalmic Assistant

Category - Lensometry and Spectacle Skills

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What is the recommended height of a bifocal segment?

6 mm above the lower lid margin
At the lower lid margin
4 mm above the lower lid margin
4 mm below the lower lid margin

Explanation

Answer: B - At the lower lid margin

The recommended height of a bifocal segment is at the lower lid margin; however, the patient should always be asked if that height is comfortable for their intended usage and if not it should be adjusted to their specifications.

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