ABO NOCE Practice Test

The cylinder power percentage for an axis of 60 is what?

1. 25%

2. 50%

3. 75%

4. 100%

The correct answer is: 75%

To determine the cylinder power percentage for an axis of 60 degrees, it's essential to recognize that the percentage is related to how much cylindrical power is present along that axis in relation to the overall cylindrical power of the lens. In the context of cylindrical lenses, the axis is the direction in which the cylinder's power is applied. The 60-degree axis specifically highlights that the power will have its peak effectiveness at this angle. The design of traditional cylindrical lenses often allows for a significant concentration of power along the primary axis. For many cylindrical lenses, it is commonly seen that the cylinder power reaches its full value (100%) at the axis itself and decreases to lower percentages at angles away from this axis. Since we are looking for the power percentage specifically at the 60-degree axis, it stands to reason that it would be maximally effective there, accounting for a full 100% of the power. Thus, the answer indicating that 75% of the cylinder power is present at the 60-degree axis would raise questions about the established norms regarding how cylindrical power is distributed. Therefore, the correct interpretation of the question highlights that at an axis of 60 degrees, the percentage of cylinder power is indeed 100%, reflecting the full extent of its effectiveness at