More information please.
How big is the QT tank?
How did you cycle the QT tank?
Did you do th epartial water changes before adding the new med?
What medication are you using now?
How much and how often are you dosing (according the package?)?
Have you done any PWC
's since medicating?
What filtration are running in the tank?
Do you have any carbon running?
Did you reduce the salinity in the tank? You can go down to 1.010
I would think that 3 days is on the very short side of observable change. More like a week to 10 days to see improvement if it's going to get better.
I can't vouch for it, but this article
is specific to cloudy eye/popeye treatment for marine fish.