against-the-rule astigmatism

against-the-rule astigmatism

With the rule astigmatism has an axis of about 180 degrees (when Rx is written in minus cylinder form). "Against the rule" astigmatism has the axis at about 90 degrees.

Both forms are common. Nevertheless, when looking at population norms, "with the rule" is more common in young adults while "against the rule" is more common in older adults.

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Category: Optometry; Contact lenses; Eye surgery
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