Standardized illumination for visual acuity testing in clinical research.

@article{Ferris1982StandardizedIF,
  title={Standardized illumination for visual acuity testing in clinical research.},
  author={Frederick L. Ferris and Robert D. Sperduto},
  journal={American journal of ophthalmology},
  year={1982},
  volume={94 1},
  pages={97-8}
}