1. Take a look at the Manual 😇
2. If that does not answer your question, don’t hesitate to email me: michael.bach@uni-freiburg.de.

The version will only increment when I make major changes. However, the release date is updated whenever anything changes. Find the release date at the main screen, top right; or use the About button – there not only FrACT₁₀’s version date is given but also the versions of embedded frameworks. The export format has its own version scheme, the exported data set starts with this version number; this allows your analysis software to easily deal with changes here.

• If you’re using FrACT₁₀ in a browser, just move the browser window to the 2nd screen.
• If you’re using the FrACT₁₀ webApp, just move the window to the 2nd screen.
• Using the older stand-alone app: There is no titlebar to pick-and-move. This works, though:
  Hover with the mouse near any edge of FrACT₁₀’s window, it will turn into a double arrow. Then press the mouse button and move the mouse orthogonally to the direction of the double arrows – the window will move along. Moving the pressed mouse initially in the direction of the arrows resizes the window, not useful here.
  [Unfortunately, the above does not seem to work on Windows. Working on it…]

When the window is on the second screen, you can use the Fullscr. button to go fullscreen. Also note: repeat size calibration (“plastic card / blue ruler”) on the 2nd screen – its pixel size might be different.

Enter a negative value for the Weber contrast in Settings>Acuity>Optotype contrast, e.g. with the max– button.

Yes, but you need a visual display unit (VDU) with really tiny pixels. In the Manual there is a note on display resolution… on this, with examples of suitable VDUs.

The technical limitation is screen size and distance. Going close and using a large screen can bring you into ultra-low vision range. Then the problem arises if the observer has sufficient vision. Here is a discussion on this.

Yes, use Settings>Display Transformation to compensate for the image inversion. [Need to use surface mirrors to avoid double images.]

This was a real question… and the answer is difficult. First: it depends on the size (Diameter), defaulf 60’. Second: an optotype (be it letter, Landolt C, tumbling E…) does not have a spatial frequency, rather it is a mixture (I’ve calculated the spectrum but never published it).

I see two possible scenarios:

• The settings for screen calibration (Length of blue ruler) and Observer distance combine to a very large optotype, and you see only its empty center
• The Optotype eccentricity setting is too large, shifting the optotype off screen.

If nothing rings a bell, use Settings>Set all to defaults: Now you should something, and you can proceed to apply your preferences in Settings.