IPhone Camera Lense Back Cover?

I have an iPhone 4 and ever since I got it I've notice the back camera has a tint or something and makes the pictures look blurred or something. So I decided to compare my brothers camera with mine and there's a difference. I took my back off and ran the camera app and its so much better and exactly like my brothers. The way the camera should be. So I came to the conclusion that the glass on the back case that covers my phone is the problem. Can I replace that small part, or do I have to buy a new back?

You should probably buy a new cover. I don't know how long you've had the cover but I think it works like headlights on a car out in the sun, the headlights iodize. If you have used your phone out in the sun that may be the problem.

Buy a new case is good!