Mechanical Keyboards

This is exactly my vision. The problems, for the past decade, seem to be getting

• accuracy
• affordable
• unobtrusive

You can pick one. Almost nothing is affordable. Accuracy seems to be directly related to how constraining it is - you need special glasses with embedded cameras, or an actual headrest like at a optometrist's, or some sort of unwieldy headgear... and prices seem to be proportional to accuracy regardless of the technology. And, in ten years, I've only noticed a single company that's working on this, with some low-res half-hearted entries for gaming, like Microsoft.

I would accept a bottom bar emitter with top bar cameras. I only care about the monitor screen(s) use case. It has to cost less than a couple thousand dollars, and it has to have, like, 4-6 pixel accuracy, for positioning a cursor accurately on one side of an "i" or the other in a text editor. This may be asking for the moon, but it anyone knows of a product, please... let me know.

The 800 lb gorilla in the market is Tobii, and they're squarely aimed at researchers (who can afford expensive equipment) and the physically handicapped (who have few choices in computer solutions). It's really hard to get either accuracy metrics or prices out of Tobii, but I figure this is one of those "if you have to ask the price, you can't afford it" situations.