@misc{indiciaed39823cbb495,
  title = {Digital visual acuity test using calculator-type numerals with geometric gradation.},
  author = {J M Lewis and T J Smith},
  year = {1987},
  doi = {10.1016/s0161-6420(87)33486-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/3574877/},
  note = {Source identifier: 3574877}
}