A shower of floaters generally refers to a whole bunch of floaters with a sudden and stark onset, not one isolated PVD as you have.
When a there is a difference in pupil sizes, this is call anisocoria
. Depending on how the pupils react and whether there are other associated signs, this can be caused by several significant medical problems, or it could be just the way you're "wired" so to speak, even if did just come on recently--this is called a physiologic anisocoria, or a difference in pupil sizes that is always less than 2mm, isn't associated with any other signs or symptoms and isn't caused by any significant medical pathology.
For those people who have a physiologic anisocoria, the amount of size disparity can vary from day to day and the "abnormal" pupil can even change sides. But a physiologic anisocoria is also usually the same size disparity in both well-lit and dim environments.
For the most part the pupil size difference is usually not related to the PVD in anyway, but mere coincidence here.
While you can see some central PVDs without dilating the pupils, whenever an exam is done for a new PVD, it is essential that the entire retina be carefully examined and that cannot be done without dilating the pupils.
I think that the watering of the eye is also an un-associated problem from the PVD and the pupil.
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