@misc{indiciaeee566f8a77c3,
  title = {The 21 point vision analysis without a phoropter.},
  author = {E L Kasperek and C Hatfield},
  year = {1975},
  url = {https://pubmed.ncbi.nlm.nih.gov/1078338/},
  note = {Source identifier: 1078338}
}