Gray spot in field of vision can be removed?

Depends on the cause: There are many causes of gray spots or spots in general in the visual field. Please seek out an ophthalmologist for a proper diagnosis; have a nice day...

Potentially: Most likely a gray spot in your vision is a floater, however there are many other causes and some are vision threatening. The first step is to see an ophthalmologist and be certain of the diagnosis. If it is a floater, most of the time your ophthalmologist will not treat it as they usually become less bothersome over time. There is a procedure that a retina specialist can do to remove floaters.