Assertion: astigmatism's eye | /r/HasAspect | astigmatism
Facets:
Source sentences:
text: Since astigmatism is a condition, you don't need the article an before it: "My eye has astigmatism," not "My eye has an astigmatism.
text: In with-the-rule astigmatism, the eye has too much "plus" cylinder in the horizontal axis relative to the vertical axis (i.e., the eye is too "steep" along the vertical meridian relative to the horizontal meridian).
text: The two eyes are usually not the same (ie if both eyes have astigmatism they may not be affected in the same line of vision or to the same degree).