@misc{indiciaeb93c1549fc1c,
  title = {Comparison of visual acuity tests and viewing condition interactions.},
  author = {P J Spicer and F J Ensell},
  year = {1973},
  url = {https://pubmed.ncbi.nlm.nih.gov/4357543/},
  note = {Source identifier: 4357543}
}