Practice Quiz

Ophthalmic Assistant

Category - Lensometry and Spectacle Skills

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What is the recommended height of a bifocal segment?
  1. 6 mm above the lower lid margin
  2. At the lower lid margin
  3. 4 mm above the lower lid margin
  4. 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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