@misc{indiciae52336fe6aea4,
  title = {Subjective and objective visual acuity testing techniques.},
  author = {S G Khan and K F Chen and M Frenkel},
  year = {1976},
  doi = {10.1001/archopht.1976.03910040746009},
  url = {https://pubmed.ncbi.nlm.nih.gov/999554/},
  note = {Source identifier: 999554}
}