The Freiburg Vison Test, FrACT, now has gained contrast threshold assessment in its all-platform version FrACT₁₀. [An isolated version, allowing full-screen takeover, is here.] It is based on JavaScript and thus can run in any current browser on any platform, including large touch devices (on-line only).
At this time FrACT₁₀ has the following options
- Visual acuity assessment using Sloan Letters, Landolt C, Tumbling E, TAO (The Auckland optotypes) and Vernier acuity
- Low-contrast acuity
- Crowding options
- Contrast threshold using Sloan Letters, Landolt C or Tumbling E as optotype
- Various sound feedback options with volume control
- Various result formats (LogMAR, decimal, Snellen fraction)
- Motivating “reward pictures” after last trial
- Result export
- via clipboard, ready to paste into a spreadsheet
- automated file export
- Operation on touch devices (tablets)
- Contrast-validation test fields
- An up-to-date manual
- Development diligently versioned with git
What FrACT₁₀ doesn’t do as yet, but it’s being planned
- Interactive gamma calibration
- Gratings
- Display transformation (mirroring, rotation)
- Improvement of contrast values using dithering
- Email export
- Stand-alone app
For “production environments”, e.g. clinical studies, you should stick to the proven and “grandfathered” classic FrACT, currently at version 3.10.5.