@misc{indiciae7bea404298e7,
  title = {Equations for Snellen equivalent.},
  author = {J W Kalenak},
  year = {1990},
  doi = {10.1001/archopht.1990.01070050017006},
  url = {https://pubmed.ncbi.nlm.nih.gov/2310323/},
  note = {Source identifier: 2310323}
}