Which statement about meridians in astigmatism is correct?

Study for the NBEO Physiological Optics Test. Prepare with flashcards and multiple-choice questions, each question has hints and explanations. Ace 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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