Assertion: primary astigmatism | /r/HasProperty | cancelled
Facets:
Source sentences:
text: On the illustration, that is the case with the stop position 2, as conics toward parabola and hyperbola open wider than the sphere for given radius of curvature (however, as the surface section outlined by the wavefront is not symmetrical about its axis, coma will be generated even if primary astigmatism is cancelled, with one half of the wavefront flatter than the other one).