I don't know, I'm not a veterinarian. I don't think anyone here is a vet. Your budgie could have an injury or a disease. Is this a recent change in your budgie's eye? If not, it could be the way it's eyes are suppose to be due to its genes.
Maybe this is a thing you should ask your vet instead of the internet. Those little creatures are very stress sensitive (they can actually die from stress..), so visit your vet as soom as possible.
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