So the disturbance is resolved? Did he have any flashing lights? Did he have any headache?
There could be 2 things going on.
One is that he experienced more floaters. Floaters are the result of the gel inside the eye that is breaking up into little pieces. If there is a lot of jarring of the eye, more could be breaking up.
Second is that he experienced an episode of ocular migraine. Ocular migraines are caused by and treated the same way as any other migraine episode. You could experience flashing lights or loss of part of your vision (similar to having a stroke). These usually last 15-20 minutes and may or may not be followed by a headache.
If he experiences this episode again, he should have his eyes checked to make sure the retina is OK. Otherwise, ocular migraines are treated with the same medications used to treat migraines.
Hope this helps and thank you.