@misc{indiciaebb2f68a9957e,
  title = {A hand optometer for measuring dark focus.},
  author = {W Jaschinski-Kruza},
  year = {1988},
  doi = {10.1016/0042-6989(88)90043-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/3253997/},
  note = {Source identifier: 3253997}
}