[GistNoesis]

Then you get some marketing logo etched into your retina :)

I'm wondering how is the laser scanned over the retina (probably some MEMS chip). What happens if the beam scanning is suddenly stopped in place, wouldn't you get the whole laser power concentrated in a small dot. And it happens so quickly that you won't have time to react.

There may also be some phantom image effects like we used to have on those old TV monitors. Or like we can have when fixating a picture.

What's probably more insidious would be projecting some very lightly superimposed structure. You probably can induce some unconscious cognitive load or nausea. By decreasing the discomfort for example when the user is looking at an ad, you will increase the effectiveness of the ad.