Assertion: astigmatism | /r/HasProperty | optical defect
Facets:
Source sentences:
text: Astigmatism is an optical defect which blurs the vision.
text: For the more general class of optical aberrations, see Astigmatism (optical systems)
text: Astigmatism is an optical imperfection that prevents the eye from properly focusing light, caused by irregularities in the shape of a person
text: Astigmatism is an optical condition of the eye in which light rays from an object do not focus to a single point but form a set of two focal lines because of variations in the curvature of the cornea.
text: Astigmatism is an optical defect, whereby vision is blurred due to irregular curvature of the cornea or lens.
text: I have just modified 4 external links on Astigmatism (optical systems).