Practice Quiz

Certified Ophthalmic Medical Technologist (COMT)

Category - COMT

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What is the position of the lens handle when the Jackson cross cylinder is used to define the astigmatic axis?

  1. Parallel to the axis.
  2. Perpendicular to the axis.
  3. At 30 degrees.
  4. At 60 degrees.
Explanation

Answer: A - The position of the lens handle is parallel to the axis when the Jackson cross cylinder is used to define the astigmatic axis.

The astigmatic power is determined by rotating the handle 45 degrees relative to the axis. Typically, the axis should be defined before the power.

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