Ask HN: Recommendations for Eye Tracking Hardware?

I am supporting a disabled loved one who is going to lose control over their body do to multiple sclerosis complicated by a series of strokes.

We have tried a tobii eye tracker c4. Unfortunately monitor mounted eye trackers are problematic for those with limited mobility and wheelchair-bound. From a positional standpoint there's a lot of variability relative to a monitor.

- Muscle fatigue causing posture changes such as head droop or leaning torso

- A person's position in the chair such as tilt or recline

- Chair alignment to the monitor

- Prescription glasses can interfere with tracking

Tobii eye tracker c4 can't cope with this kind of environment. In addition Tobii does not really support the disabled community. Tobii restricts any other language besides C,C#,C++ via the Stream Engine or Interaction Library API. The creation of a wrapper to gather data to pipe to another language is prohibited in end-user license agreement. This severely hampers accessibility communities ability to create tools they need to thrive.

Any recommendations for reasonably priced eye tracking hardware that are mounted to headset (not VR/AR) preferably wireless that with a permissive software license?

Thank you in advance!