FAQ: How do I delete calibration files?

[Sam]

Occasionally corrupt calibration files can cause issues for the Host PC software. A common symptom is everything working perfectly during calibration, but then at the validation or recording stage, the eye is no longer tracked. The thumbnail image of the eye may show a "BOUNDS" error, and typically the crosshairs disappear. This issue can sometimes occur after attempting to calibrate "difficult" participants such as infants, if a "poor" calibration model is inadvertently accepted. It can also occur if the Host PC has been provided with inaccurate information about the screen dimensions and distances. The solution is to ensure that the Host PC has the correct screen information, and to delete the calibration files. Please refer to your systems installation guide to ensure that you have configured the screen settings appropriately, and check your experimental script is providing sensible values to the screen_dist and screen_phys_coords commands if these are being used.

To delete the calibration files, please take the following steps, depending on your EyeLink system.

EyeLink 1000 Plus and EyeLink Portable Duo
1) Press CTRL+ALT+Q on the Host PC to exit to the File Manager
2) On your Display PC point a browser to 100.1.1.1 (this should bring the File Manager software up in the browser window)
3) Navigate to the exe subfolder of the elcl folder and select the details view:

   

4) Sort the files by type and select all files with a .cal extension:

   

5) Right click and select "Delete"
6) Find / Select the lastrun.ini file and delete that too
7) Start the eye tracking software again


EyeLink 1000 and EyeLink II
From the Host application, quit to the DOS prompt - press CTRL-ALT-Q or click the "Exit EyeLink" button

next type

DEL *.CAL <press Enter>
DEL LASTRUN.INI <press Enter>

start the Host software again:

T <press Enter>