@misc{indiciaec53ea933aa64,
  title = {Demonstrating astigmatism.},
  author = {P A Harvey},
  year = {1996},
  doi = {10.1038/eye.1996.175},
  url = {https://pubmed.ncbi.nlm.nih.gov/9091377/},
  note = {Source identifier: 9091377}
}