To cite eye in publications, please use:

T.F.C. Heeren. The eye package for R: A tool for ophthalmic data analysis, London, UK, 2021.

Corresponding BibTeX entry:

  @Manual{,
    title = {The eye package for R: A tool to facilitate analysis of
      ophthalmic data},
    author = {Tjebo F.C. Heeren},
    year = {2021},
    address = {London, UK},
    note = {version 1.3},
    url = {https://github.com/tjebo/eye},
  }