Thank you for the response. Yes, right now I have a delay timer which throws an alert when user gaze is no longer on focus object (out of focus). I was wondering if there were other approaches. I am building an app for elderly patients to trace lines while focusing on an onscreen object/point which will be used by medical experts to correlate with disease. Right now alert messages are thrown very frequently since the object they are to focus on is smaller than the gaze trace bubble which appears on screen. Hence I was wondering if there was some way to tweak its sensitivity or radius to handle this.