Set up Minecraft to use mouse emulation
If you are controlling EyeMine by using mouse emulation - i.e. setting up your eye tracker software to move the cursor to follow your gaze, then you need to change a setting in Minecraft.
In the main Minecraft menu, go to Mods, and select EyeGaze from the list. Click 'Config' -> 'Basic options' and turn on 'Enable mouse emulation compatibility mode'.
NOTE: Occasionally the Mod list in Minecraft does not allow you to click on "Eye Gaze". If this happens, restart Minecraft and try again!
See also a full resolution video of setting Minecraft's mouse emulation compatibility mode.