@misc{indiciae5643a4966347,
  title = {Diffractive bifocal lens designs.},
  author = {A L Cohen},
  year = {1993},
  doi = {10.1097/00006324-199306000-00003},
  url = {https://pubmed.ncbi.nlm.nih.gov/8336907/},
  note = {Source identifier: 8336907}
}