The prescription +3.00 -4.00 x 090 represents which kind of astigmatism?

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Multiple Choice

The prescription +3.00 -4.00 x 090 represents which kind of astigmatism?

Explanation:
In astigmatism, two principal meridians focus at different distances, and the prescription shows how power differs between those meridians. The axis marks the meridian that has no cylindrical power; the cylinder power is applied in the perpendicular meridian. Here, the sphere is +3.00, so baseline focus in all meridians starts as hyperopic (+3.00). The cylinder is -4.00 with axis at 090, meaning the 180-degree meridian gets the cylinder’s effect. So the power in the 180 meridian becomes +3.00 + (-4.00) = -1.00, which is myopic. Since one meridian is hyperopic (+3.00) and the other is myopic (-1.00), this is mixed astigmatism.

In astigmatism, two principal meridians focus at different distances, and the prescription shows how power differs between those meridians. The axis marks the meridian that has no cylindrical power; the cylinder power is applied in the perpendicular meridian.

Here, the sphere is +3.00, so baseline focus in all meridians starts as hyperopic (+3.00). The cylinder is -4.00 with axis at 090, meaning the 180-degree meridian gets the cylinder’s effect. So the power in the 180 meridian becomes +3.00 + (-4.00) = -1.00, which is myopic.

Since one meridian is hyperopic (+3.00) and the other is myopic (-1.00), this is mixed astigmatism.

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