Hi @chaimdryzun1980 and thanks for your query. I am afraid the pupillary distance is not a metric that is directly exported either in the Tobii Core Software or the accompanying SDK’s.
That being said, if you are a capable programmer, then I would recommend to take a look at the Tobii Stream Engine API which can provide you the x,y,z co-ordinates for each eye being tracked and from there you should be able to calculate the approximate distance between the centre of both pupils.
You can download the stream engine API @ https://developer.tobii.com/consumer-eye-trackers/stream-engine/
If this calculation is a one-off for your own interest then this should be sufficient, however if you are intending on developing an application that uses this metrics for analysis, you will be required to purchase an analytical use licence from Tobii. Further details about this you can read @ https://analyticaluse.tobii.com/
Please do let us know if we can provide any further information. Best Wishes.