A prescription like +3.00 -4.00 x 090 indicates which type of astigmatism?

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Multiple Choice

A prescription like +3.00 -4.00 x 090 indicates which type of astigmatism?

Explanation:
This reflects mixed astigmatism. In minus-cylinder notation, the axis is the meridian with no cylinder power, so along 090 the eye has +3.00 D. The perpendicular meridian (180) gets the cylinder’s power, so its power is +3.00 + (-4.00) = -1.00 D. So one meridian is hyperopic (+3.00) and the other is myopic (-1.00). When the two principal meridians have opposite signs, that’s mixed astigmatism.

This reflects mixed astigmatism. In minus-cylinder notation, the axis is the meridian with no cylinder power, so along 090 the eye has +3.00 D. The perpendicular meridian (180) gets the cylinder’s power, so its power is +3.00 + (-4.00) = -1.00 D. So one meridian is hyperopic (+3.00) and the other is myopic (-1.00). When the two principal meridians have opposite signs, that’s mixed astigmatism.

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