Hey sorry this is so late. Didn't realize what you meant by contextual input or how that could be useful, but you're right - I can't deny such a fuzzy statement. It's somewhat possible that this could help something sometime in the future, definitely. Apologies for calling you incorrect. Eye tracking is however not efficient or useful as a main input for typing and will very likely not take a leading role in helping to recognize word/sentence input to computers.
On the second statement, I meant my original comment about google handwriting, the one at the top of this tree - not your comment about eye tracking. So I apologize again - I must have not been clear in the way I stated that and I'm sorry you took offense.
Actually, you are totally incorrect. If you look back at the thread, I am not proposing eye tracking as a sole means of input, but as a means of providing contextual information to other means of input.
> I realize my first comment was kind of mean and sarcastic, but that was because this idea is so completely stupid and not progressive at all that I thought the relatively intelligent community on hacker news would realize this immediately. All my friends and co-workers who saw it were like "this is completely dumb"... immediately.
Then at least you or you and your friends are guilty of sloppy reading, of a level I do not expect for HN. Again, this is not proposed as a primary means of input, but as an enhancement to contextual information for speech and handwriting input.