@misc{indiciae67ff42791a35,
  title = {Binocular direct ophthalmoscope.},
  author = {D D Donaldson},
  year = {1969},
  doi = {10.1001/archopht.1969.00990020773010},
  url = {https://pubmed.ncbi.nlm.nih.gov/5355266/},
  note = {Source identifier: 5355266}
}