If a plus cylinder Rx with axis 080 is converted to minus cylinder, what is the new axis?

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Multiple Choice

If a plus cylinder Rx with axis 080 is converted to minus cylinder, what is the new axis?

Explanation:
In spherocylindrical notation, the axis is the meridian with no cylinder power. When you convert from plus cylinder to minus cylinder, the cylinder sign flips and the axis shifts by 90 degrees to keep the same optical effect. So you take the original axis (080) and add 90 degrees, giving 170 degrees. Axes wrap around at 180, but 170 stays as 170. Thus, the new axis is 170.

In spherocylindrical notation, the axis is the meridian with no cylinder power. When you convert from plus cylinder to minus cylinder, the cylinder sign flips and the axis shifts by 90 degrees to keep the same optical effect. So you take the original axis (080) and add 90 degrees, giving 170 degrees. Axes wrap around at 180, but 170 stays as 170. Thus, the new axis is 170.

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