Certified Paraoptometric (CPO) Practice Exam 2025

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What does the "pantoscopic angle" indicate?

  1. The angle between the temple and the frame front

  2. The angle of the lenses concerning the horizontal plane

  3. The tilt of the nose bridge

  4. The curvature of the lens surface

The correct answer is: The angle between the temple and the frame front

The "pantoscopic angle" specifically refers to the angle of the lenses in relation to the horizontal plane. It indicates how much the lenses are tilted inward from the vertical position toward the wearer's face. This angle is crucial for ensuring optimal vision and comfort as it can affect how light enters the lens and the position of the optical center relative to the pupil. While the option you chose focuses on the relationship between the temple of the frame and the front, this option does not accurately define the pantoscopic angle itself. The tilt of the lenses is essential for proper alignment and vision correction, which is the primary focus of the pantoscopic angle measurement.

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