6b514bce_ter_Fish___Minnesota_Sea_Grant__Symptom
[Parasite] EYE FLUKE (Diplostomulum spp.) [Type] fluke [Description] Microscopic larval flukes live in fluid of eye, often causing popeye. Bulging subsides but blindness may result. [Edible] Yes [Recommendation] Clean fish and prepare as usual [Symptom] 
Eye trouble: bulging (popeye); opaque or shrunken; fish apparently blind
Parasites of Freshwater Fish | Minnesota Sea Grant
Symptom