What is the second number in this prescription referred to as? -4.00 -1.25 x 080

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Multiple Choice

What is the second number in this prescription referred to as? -4.00 -1.25 x 080

Explanation:
In eyeglass prescriptions, the numbers are written in the order: sphere, cylinder, axis. The sphere part (-4.00) covers the overall focusing error. The second value (-1.25) is the cylinder power, which corrects astigmatism by adding cylindrical power to the lens. The axis (080) shows the orientation of that cylindrical correction, not its strength. So the second number is cylinder power, which is why the correct answer is the cylinder power. The prism is a separate consideration and isn’t indicated here.

In eyeglass prescriptions, the numbers are written in the order: sphere, cylinder, axis. The sphere part (-4.00) covers the overall focusing error. The second value (-1.25) is the cylinder power, which corrects astigmatism by adding cylindrical power to the lens. The axis (080) shows the orientation of that cylindrical correction, not its strength. So the second number is cylinder power, which is why the correct answer is the cylinder power. The prism is a separate consideration and isn’t indicated here.

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