A minimum screen resolution of 1366×768 is required

Please note you will not be able to use the software until you are emailed a user name and password by your vision therapy provider.

Before you can use the software, you must take a few measurements on your computer monitor, which requires a metric measuring tape.  If you don’t have one, a printable one can be downloaded here. 

  Windows (10 and higher, 64 bit)

  • Download the installer file here.
  • Run the installer.  A shortcut will be added to your desktop.
  • Double click on the shortcut to start.
  • Windows might show a warning dialog saying it’s an “unrecognized app” or from an “unknown publisher.” You can proceed by clicking on “more info” and then “run anyway.”
  • Some versions of Windows 10 and 11 are setup to only allow installation of software from the Windows Store. You can get around this by switching out of S mode.

  Linux (X86, 64 bit)

  • Click here to download
  • Extract the zip file in whatever directory you want.  This will create a new folder called “Tritheia” and a startup script called “”
  • Click on the startup script to run. Depending on the distro, you may need to set the file permissions to be executable.
  • This version was built on Ubuntu 20.04, but it should run on any recent Linux distro.

  MacOS (Mojave or newer)

  • Click on this link to download the zip file.
  • The zip file will probably get extracted automatically after you download it. If not, open the file and extract it to the desktop or any folder you want.
  • Right click or Ctrl + click on the app, and select “open.”  If you left click, it may not allow you to run it for the first time.
  • There’s a good chance that MacOS will quarantine the app and not allow you to run it. It does this to apps downloaded from the internet to try to prevent users from potentially installing malware (and to keep you reliant on their app store.) There are a few work-arounds for this:
    • Download the file using a different computer running Windows or Linux. Save the file to a USB drive and move it over to your mac.
    • A second option is to disable the app quarantine from the terminal:
      • Using Finder, go to Applications -> Utilities -> Terminal.
      • In the terminal type “xattr -d” followed by a space, then drag the app icon into the terminal window (to copy in the location of the app.) Then press enter. The app should now be runnable!
    • A third option is to run the Windows or Linux version in a virtual machine (using something like Parallels or Virtualbox.)

Will it run on Chromebook, Android, or iOS?

  • It’s possible to run it on many Chromebooks with an Intel processor by enabling Linux apps and installing the Linux version. If it’s a Chromebook from school, that feature was probably disabled though.  Here is a howto from Google.
  • It’s not currently availaible on iOS or Android.