@misc{indiciae3839b492d78a,
  title = {A convenient accommodative target for near fixation.},
  author = {E F Purcell},
  year = {1967},
  doi = {10.1016/0002-9394(67)93676-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/6027361/},
  note = {Source identifier: 6027361}
}