Cloudy eye localized to just one of the two is usually from some sort of injury/abbrasion or aggressiveness from tank mates. Best results will come from a few large water changes with well aged/aerated SW. Fortified feedings with a good liquid vitamin/HUFA content will also be a plus.
More often than not, the above will be all you need. Medications/QT is usually not needed unless the problems worsens or both eyes become affected.
Cheers
Steve
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