Just to disambiguate, are you asking about R or RStudio (the IDE — see detail in FAQ, below).
R itself is quite accessible (see report from A. Jonathan R. Godfrey linked to below, also available as free open article here).
https://r-resources.massey.ac.nz/StatSoftware/
RStudio (the IDE), however, is not, as of yet.
See also the BrailleR package
https://cran.r-project.org/web/packages/BrailleR/vignettes/GettingStarted.html