Well, Marshall has to have eye surgery on July 25.
Evidently the vitreous fluid behind the retina has broken loose and formed large globs of "gel" that are floating in his eye and making vision in the right eye almost impossible.
The retina specialist (at the University of Colorado) will remove the vitreous fluid and replace it with an air bubble and some saline. Within a week or so, the air bubble will be absorbed by the body and the eye will start making its own saline solution.
The recovery will be like recovery from cataract surgery. One week of total rest and using eyedrops every day, wear a patch to bed. On the second week, he can move around more freely and resume most normal activities (although probably not motorcycle riding for a while).
Since his next visit with the oncologist is on July, we will be at a hotel for the 24th, 25th and 26th.