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Focus 3 eye tracking - eye openness always shown as '1'.

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I'm a student now developing an app with Unity, and I have a problem with GetEyeOpenness.

I use the code below to get the openness feature, but when I start the app, the openness of the left and right eye are always shown as '1'.

Has anyone ever seen this kind of problem? thank you.

        bool isLeftEyeOpennessAvailable = EyeManager.Instance.GetLeftEyeOpenness(out LEO);
        bool isRightEyeOpennessAvailable = EyeManager.Instance.GetRightEyeOpenness(out REO);

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