@misc{indiciae9d8192232611,
  title = {A new technique for portable gonioscopy.},
  author = {S H Perlstein and J M Galst},
  year = {1981},
  doi = {10.1016/0002-9394(81)90188-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/7468746/},
  note = {Source identifier: 7468746}
}