My Vision Test Battery FrACT₁₀ has learned something new: Assessment of grating contrast thresholds.

  • You select spatial frequency and patch diameter (in Settings▸Contrast), and it will hone in on the threshold.
  • An approximate Gaussian window smoothes the grating edge.
  • Error diffusion allows for accurate threshold in spite of 8-bit limits.
  • Downloadable as a progressive web app.
  • For giggles, try ‘Autorun to target contrast’.