How can I get current distance between eyes in HMD?

How can I check what interpupilar distance is set by player on hmd?

I found out how to do it on Oculus. Can anyone tell me how to do it with HTC Vive/SteamVR?

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Hello there, did you ever get your answer to this? I would like to know.
thanks

No, but we are developing mainly using oculus so we did not investigated it further yet. If I find out anything, I’ll post it here.