When my trigger had popeye (huge bulging eye very cloudy) I treated it with Seachem Paraguard in a quarantine tank and it took very long to really resolve the popeye but the cloudiness was much better after 3 weeks. You cannot treat in a display tank though.
Another option would be to treat antibiotics in the food but this is not very easy in a reef tank to control the dosage and could very well end up killing the fish by overdosing.
Garlic? ..it's probably not going to do much for a cloudy eye..but hey..you can try it.
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