as an optometrist that worked at the urgent eye care clinic. i've treated lots of iritis/uveitis with pred.
oral pred will not help ur eye much.
i would recommend u see an eye doc to make proper diagnosis before asking the family doc for steroid eye drop.
family doc does not have the eye slit lamp microscope to make sure its iritis vs. infection of some type
if bacterial or herpes infection, steroid can make it worse.
also if ur getting floaters, there may be deeper inflammation in the vitreous, which in order to visualize, the doc needs to dilate the eyes and require proper equipment to diagnose.
finally, prolong steroid eye drop use may lead to high eye pressure>> may lead to glaucoma. so eye pressure needs to be checked by eye doc regularly if using pred eye drops.