Newborns are more likely to have which type of astigmatism?

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Prepare for the NBEO Human Development Exam with comprehensive quizzes and detailed explanations. Sharpen your understanding with multiple choice questions designed to mimic the real test. Get ready to succeed!

Multiple Choice

Newborns are more likely to have which type of astigmatism?

Explanation:
Astigmatism orientation is defined by which meridian carries the refractive power. The axis marks the meridian with no cylinder power; the other meridian has the extra power. If the horizontal meridian is relatively steeper, the cylinder power lies in the vertical meridian, placing the axis around 90 degrees. This pattern is common in newborns, so the astigmatism tends to be against-the-rule (ATR). In infancy, the cornea often presents with a relatively steeper horizontal meridian, producing ATR astigmatism more commonly than the vertical-steep (with-the-rule) or oblique patterns.

Astigmatism orientation is defined by which meridian carries the refractive power. The axis marks the meridian with no cylinder power; the other meridian has the extra power. If the horizontal meridian is relatively steeper, the cylinder power lies in the vertical meridian, placing the axis around 90 degrees. This pattern is common in newborns, so the astigmatism tends to be against-the-rule (ATR). In infancy, the cornea often presents with a relatively steeper horizontal meridian, producing ATR astigmatism more commonly than the vertical-steep (with-the-rule) or oblique patterns.

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