What is the axis of the manifest refraction in the example?

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Multiple Choice

What is the axis of the manifest refraction in the example?

Explanation:
In a manifest refraction, the axis tells you which meridian has no cylinder power; the cylinder power is oriented 90 degrees away from that axis. An axis value of 180 degrees means the axis line is horizontal (left to right), so the cylinder power is applied in the vertical meridian. Therefore, if the example shows an axis of 180, the axis is the horizontal meridian, and the cylinder correction lies along the vertical meridian. (Note: 0 and 180 refer to the same axis, while 90 and 270 refer to the same perpendicular axis, and 135 is an oblique axis.)

In a manifest refraction, the axis tells you which meridian has no cylinder power; the cylinder power is oriented 90 degrees away from that axis. An axis value of 180 degrees means the axis line is horizontal (left to right), so the cylinder power is applied in the vertical meridian.

Therefore, if the example shows an axis of 180, the axis is the horizontal meridian, and the cylinder correction lies along the vertical meridian. (Note: 0 and 180 refer to the same axis, while 90 and 270 refer to the same perpendicular axis, and 135 is an oblique axis.)

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