@misc{indiciaebb534af9daaf,
  title = {Aids for visual impairment.},
  author = {N J Dudley},
  year = {1990},
  doi = {10.1136/bmj.301.6761.1151},
  url = {https://pubmed.ncbi.nlm.nih.gov/2252929/},
  note = {Source identifier: 2252929}
}