@Ysabelle-S - interesting question, as I now have multiple problems with my eyes, what with the ME issues, plus having a macular hole in one eye 7 years ago with resultant op for that and a cataract following, now a detached retina in the other eye (7 weeks ago!), with resultant op slowly repairing thankfully, with cataract to come, PLUS frequent ocular migraines sometimes both eyes, sometimes one sided! Oh boy what a mix.
I too have blurriness first thing in one eye,(the one from the earlier operation), though recently it seems to have improved (don't know why), however I now have a lot of allergy since my eye op (probably triggered by the pharmaceutical meds is my guess), and a few weeks ago I went for an eye test at the hospital post eye op, and it was my 2nd check up. I was horrified to see that the eye chart was completely blurred with the eye recently operated on, and seemingly my sight was worse than the 1st check up!! At that point they handed me a 'thingy' (sorry don't know the name) which was something you hold up to the eye with lots of small holes in it, while shielding the other eye, and bingo! I could see OK. Not sure entirely how that works, but it sorted out the blur at any rate.
I was due to go for an eye check for new glasses today actually, post op, but had to cancel due to this wretched allergy which this time is causing nose streaming rather than eye blur.
Goodness, it's a problem isn't it - and I don't have an easy answer for you. Luckily my recent op has actually resulted in an improvement curiously, as previously I was quite long sighted in both eyes, but now the 'bad' eye has become short sighted following the op (it can change the shape of the lens, and the previous op made the other eye long sighted!), so I can now read writing without my glasses that I needed previously. Nice to have a bonus from a scary operation.