Certified Paraoptometric (CPO) Practice Exam 2025

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What defines the retroscopic angle or tilt of a frame?

  1. The angle between the frame and the forehead

  2. The angle the frame front makes with the frontal plane

  3. The distance between the frame and the eyes

  4. The width of the frame at the temples

The correct answer is: The angle the frame front makes with the frontal plane

The retroscopic angle, or tilt of a frame, is defined as the angle the frame front makes with the frontal plane. This angle is crucial for ensuring that the lenses are positioned correctly in front of the eyes, facilitating optimal visual performance and comfort for the wearer. When the frame is tilted back at this angle, it helps to reduce the incidence of light reflection off the lenses and can improve both aesthetic appearance and functional aspects of vision. In contrast, the other options do not accurately describe the retroscopic angle. The angle between the frame and the forehead refers to a different relationship that does not specifically define the tilt in relation to the frontal plane. The distance between the frame and the eyes pertains more to fitting adjustments and focal performance rather than the angle itself. The width at the temples relates to the frame's overall size and fit but is not related to the tilt or angle defined by the frame's position in relation to the frontal plane.

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