Astigmatic Chart, Verhoeff's. The concentric circles connecting the radial lines or spokes have a tendency to make the astigmatism

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@misc{67656,
  title        = {{Astigmatic Chart, Verhoeff's. The concentric 
                   circles connecting the radial lines or spokes have
                   a tendency to make the astigmatism}},
  pages        = {p0005},
  booktitle    = {{Tests for Color Perception, Visual and Auditory 
                   Acuity: Used in Railway, Miltary and Marine
                   Services, also in the Arts and Sciences, for
                   Research, Experimentation, Educational and
                   Vocational Guidance}},
  publisher    = {Chicago: C. H. Stoelting Co.},
  copyright    = {Creative Commons Attribution-NonCommercial},
  url          = {https://vlp-new.ur.de/images/img3501}
}