Certified Paraoptometric (CPO) Practice Exam 2025

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What does the "seg height" measure in multi-focal lenses?

  1. The total height of the lens

  2. The height from the deepest part of the eyewire to a reference point

  3. The thickness of the lens at its center

  4. The height of the frame from top to bottom

The correct answer is: The height from the deepest part of the eyewire to a reference point

The "seg height," or segment height, is an important measurement in fitting multifocal lenses, as it determines the vertical placement of the reading segment in the lens. Measuring from the deepest part of the eyewire to a particular reference point ensures that the segment aligns correctly with the wearer’s line of sight while they are reading or engaging in close work. This precise placement is crucial for optimal visual performance and comfort with multifocal lenses. The total height of the lens and the thickness of the lens at its center do not specifically measure how the reading segment is positioned relative to the wearer’s gaze. Similarly, the height of the frame from top to bottom simply gives the overall dimensions of the frame rather than focusing on the functionality of the bifocal or multifocal lens segment. Thus, the correct understanding of seg height emphasizes its role in ensuring the effective and appropriate positioning of the reading portion of the lens for the wearer.

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