Rear camera near object blurry not focus

Hello,

This may be a damaged camera as something might have got damaged inside of the camera and now it's not working properly. However, I would first take the phone apart and clean the camera lens with an alcohol-dipped cotton bud and then test it again. I would also clean the inside and outside of the glass that is in the housing. If still not working then I would order a new camera.

You can order it here (From ifixit): iPhone 5s Rear Camera

This can be bought new or used but if you really don't have much money to spend on the part then I would recommend heading over to eBay and buying a genuine apple rear camera used. Make sure it's genuine Apple and the used ones are usually always working.