You are correct that your symptoms from PVD or posterior vitreous detachment, common event that happens in many people.
You have a thick gel material in the middle of your eyes. Over time, it liquifies and can sometimes clump together causing floaters. As it liquifies, this gel material collapses on itself and pulls away from the wall of the eye. In the process it can stimulate the retina -- causing the flashes that you see.
It is recommend that you see your ophthalmologist
to look at the retina during your scheduled visit. This is to make sure there are not problems such as a retinal hole or tear. In most people, there are no problems, but this exams are precautionary and allows for preventative treatment of any lesion that is found.
Regarding activity restriction, you should be able to do most thing. Changing the litter boxes and other care with your cats (holding and lifting) should be OK. If you notice a sudden increase in floaters, flashes of light (like a lightening storm), or a shadow/veil in the periphery of your vision, this can be worrisome for a retinal detachment
. You would need to contact your ophthalmologist promptly in that case to check for any changes in your retina.
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Disclaimer: Information provided is for educational purposes only and does not establish a patient-physician relationship nor substitute for a personal consultation with a physician.