"Astigmatism" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus,
MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure,
which enables searching at various levels of specificity.
Unequal curvature of the refractive surfaces of the eye. Thus a point source of light cannot be brought to a point focus on the retina but is spread over a more or less diffuse area. This results from the radius of curvature in one plane being longer or shorter than the radius at right angles to it. (Dorland, 27th ed)
Below are MeSH descriptors whose meaning is more general than "Astigmatism".
Below are MeSH descriptors whose meaning is more specific than "Astigmatism".
This graph shows the total number of publications written about "Astigmatism" by people in this website by year, and whether "Astigmatism" was a major or minor topic of these publications.
To see the data from this visualization as text, click here.