Which statement about meridians in astigmatism is correct?

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Prepare for the NBEO Physiological Optics Test with flashcards and multiple choice questions, each offering hints and explanations. Equip yourself for your exam!

Multiple Choice

Which statement about meridians in astigmatism is correct?

Explanation:
In astigmatism, there are two principal meridians with different curvatures, and the meridian with greater curvature has more optical power. When the vertical meridian is steeper, that is with-the-rule astigmatism, so the vertical meridian carries more refractive power while the axis is horizontal. This matches the statement: the vertical meridian is steeper in WTR. In contrast, against-the-rule would have the horizontal meridian steeper with the axis near vertical.

In astigmatism, there are two principal meridians with different curvatures, and the meridian with greater curvature has more optical power. When the vertical meridian is steeper, that is with-the-rule astigmatism, so the vertical meridian carries more refractive power while the axis is horizontal. This matches the statement: the vertical meridian is steeper in WTR. In contrast, against-the-rule would have the horizontal meridian steeper with the axis near vertical.

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