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Hi @kytang, thanks for your query. Within the EyeX SDK (which is now deprecated) and the new Core SDK gaze point data is indeed only provided by the average from both eyes.
For projects that require individual gaze data per eye, this requires the Tobii Pro SDK (https://www.tobiipro.com/product-listing/tobii-pro-sdk/) which will operate freely with the Tobii Pro range of eye trackers (X3-120, X60, etc).
However, if you need to use the Pro SDK in conjunction with the Tobii Tech range of Eye Trackers (4C, EyeX) then this requires the purchase of a special licence to do so. If you are interested, please send a speculative email to: [email protected] with a description of your project and your academic or professional affiliation and we will provide you with an appropriate quote.
Please let us know if we can be of any further assistance.