Well, I see again I've fallen out of the habit, and hardly have the inclination to start again, but let's try personal anecdotes, see if that helps:
Two or three years ago I had a problem after a small aneurysm in the
fovea of one eye which did no lasting harm, but was scary. It might
not have been noticed except in such an important part of the retina,
the very spot where the sharpest vision occurs. It produced a visual
effect that looked like an uneven blob-shaped flashbulb after-image
that didn't fade for months, and introduced me to the confusing world
of eye-docs. They specialize like nobody else!
My primary care doctor referred me to an eye-doc generalist who
examined my vision and referred me to a retina specialist because only
that specialist could refer me to the retina super-specialist, part of
a group practice where each doc every week works a day in each of four
different offices, so the whole state gets coverage. Fancy goldfish
tank; help-yourself bagels and coffee and sandwiches since so many of
the patients are diabetic. Very workman-like, sit in the waiting room,
get called to read an eye chart and have the results recorded, back to
wait a while, get called by the eye-dilation tech, back to wait a bit
for the eyes to dilate, be called to have retinas photographed (that'd
be an interesting series of photos if presented in time-lapse: the
clot left by the aneurysm smaller at each visit, always the shape of
the "after-image" it produced) , quite a production, eventually see
the doctor. When he's done with each visit, there are one-shot
sunglasses for anyone who forgot to bring better ones. He offered
laser surgery to remove the clot but advised watchful waiting instead
(if anything goes wrong in the surgery, it goes wrong for life), so he
essentially did nothing, but expertly. Took a couple of months, but
the clot was absorbed over that time by just waiting, so I don't
complain, just remark.