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Does your phone has a protective case/film? check if the lens its dirty, or if it has scratches.
Could you clean the camera lens and also
settings > apps > all > camera > clear data > restart the phone > check again.
Don't worry about it, now you know where to come if you have any more questions, btw if you experience poor battery life, backup your phone and repair it with PCC, it will smooth things out.
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
If the object its near the lens it will take a macro picture, that's why I'm askin gif there's anything near it, even your fingers.