Hmm. This happened to my wife about 2 weeks ago: Turned out to be a tear in the retina and localised detachment. After speaking to optician, we went to Gartnaval, where they did some laser treatment, so "spot weld" the retina back on.
She gets "floaters" anyway, but these were much worse for her. Also flashes of light. She also said she had cloudy vision, which doc says was blood in the eyeball from the tear which would dissipate over time.
On 2nd check up, they did more laser treatment, but due to position of the tear, they cannot circle right around it, leaving a section (11o'clock to 1oclock) without laser treatment. She is still getting some flashes.
No word of any need for an op, but some regular checkup appointments for a while. (My sis-in-law had an operation for a detached retina under a local, where they seemed to put some balloon in the eyeball and inflate to press retina back on. She had good outcome)