Hi. I'm online and happy to answer your question today.
It depends upon the underlying pathology that is causing your cornea to swell. If the pathology is self limited then you can stop the drop when things get better. If the swelling is due to something like Fuchs dystrophy you may have to use the drops forever -- or until you get new endothelial cells from DSEK surgery or a corneal transplant.
Does this make sense to you?
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