In the astigmatism test, astigmatism is present if some groups of radiating lines on the astigmatism chart appear red, while others appear black.

Name: In the astigmatism test, astigmatism is present if some groups of radiating lines on the astigmatism chart appear red, while others appear black.
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Question

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In an astigmatism test using a chart, the indication of astigmatism is if some lines appear blurrier or less sharp than others, not a change in color.

In the Astigmatism Test, Astigmatism Is Present If Some Groups