Hi @maryam, thanks for your query. Whilst we do provide distance from the user’s eyes (gaze origin) to the origin of the eye tracker, which is situated in the lenses of the HMD. We unfortunately do not however provide a distance to the display itself.
With regard to eye images, Neither Tobii nor HTC provides this data for the Vive Pro Eye I am afraid. My apologies for the disappointing news, hopefully you manage to find a workaround for your needs.
Please do let us know if we can provide any further information. Best Wishes.