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There are a few diseases that are common in the eye. The first and most well known is cataracts. The second is glaucoma.
If you suspect that there might have been an injury to the eye, you need to see the vet so that they can stain the eye and look for any scratches or problems.
Many eye problems are treatable if you catch them soon enough. I suggest that you see the vet as soon as you can.
Let me know if you have more questions.