@misc{indiciaebb41a3087026,
  title = {Letter: Classification of visual performance.},
  author = {B E Spivey and A Colenbrander},
  year = {1976},
  doi = {10.1001/archopht.1976.03910040135020},
  url = {https://pubmed.ncbi.nlm.nih.gov/938299/},
  note = {Source identifier: 938299}
}