Assertion: astigmatism | /r/CreatedBy | lens
Facets:
value: most often
type: DEGREE
Source sentences:
text: Astigmatism is most often caused by an ellipsoid (football-shaped) cornea or lens rather than a normal, spherically shaped cornea or lens.
text: Astigmatism is most often caused by an ellipsoid (football-shaped) cornea or lens rather than a normal, spherically shaped cornea or lens.
text: Astigmatism is a common refractive error caused by a cornea or lens that has an irregular shape, so light is refracted poorly onto the retina.