A. If it's a slow progressing cloudiness then it's probably a normal degeneration of the eye related to age, there isn't anything that can be done about it.
If the cloudiness is severe and rapidly advancing it could be cataract. In that case I would advise taking him to an eye specialist to get it corrected.
A. It is important for your veterinarian to first determine the cause of the cloudiness. Cloudiness of the eye can be caused by cataracts, trauma, and infection. It is difficult to suggest a plan of action without first knowing the cause. Your veterinarian will be able to examine the eye and perform diagnostics to diagnose the problem and then provide treatment.
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