can a green spotted puffer fish go blind?

and if so can it be caused by ich? and what are the signs on ich in a puffer?
i tired researching but they don't really answer my questions.. :/
thanks
(btw , shes in a 20gal tank by herself. the salt level is 1.019 and shes 1inch long. shes eating okay but she seems really disoriented)
 
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