If you're using Eyeware Beam: 60FPS+ webcam eye tracking was made available for Star Citizen with the latest release, if your webcam supports higher frame rates (e.g. Logitech Brio, Elgato Facecam, ...).
SentiGaze technology for real-time eye movement tracking using webcam and PC - YouTube
WebCam eye tracking accuracy
Eye movement tracking with webcam for heat maps and gaze-based control
Tagged with webcam eye tracking - Tobii
How accurate is Webcam Eye Tracking? (2023 Update)
10 Free Eye Tracking Software Programs [Pros and Cons]