ABO NOCE Practice Test

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Prepare for the ABO NOCE Test with concise flashcards and multiple-choice questions. Each question includes hints and explanations, ensuring you're exam-ready!

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What is the percentage of cylinder power based on the axis of 45?

25%
50%
75%
100%

The correct answer is: 50%

In the context of cylindrical lenses, the cylinder power refers to the strength of the lens that is used to correct astigmatism. When considering the axis of a cylinder, the power is distributed across various meridians, and the percentage reflects how much of the total power is effective at that particular axis. For an axis of 45 degrees, the effective cylinder power can be understood in terms of the distribution of power. At this orientation, the power is equally distributed among the four quadrants of the lens, which typically correspond to the common axes of 0, 90, 180, and 270 degrees. When analyzing the effectiveness of the cylinder power at 45 degrees, we find that 50% corresponds to either of the two power meridians directly at 45 and 135 degrees. This means that 50% of the total cylinder power is effective at correcting astigmatism along the 45-degree axis. Hence, identifying this relationship allows us to determine that the correct percentage of cylinder power based on the axis of 45 is indeed 50%.