As was the more ominous 'other things' which I suspect might mean pointy knife to the eyeball so I understand they don't mention that at the start as it might worry people and they might not come back for the investigation.

The easiest way to describe it is when you drop black ink into water and get dark blobs and then swirling curtains of dark black to translucent grey in my right eye. When the blood has cleared they will get me back to do more investigation and see if anything needs doing, 'laser' was mentioned.