Problem in dslr lens?

Please see this pic
This is mY af-dc nikkor 135 mm lens. It was fall down to the floor and the outer ring distorted. I know i'm lucky there's no further damage. But this will affect picture quality… Little.a little, the little?
I have seen through this lens after removing from camera and i noticed that the ring is not seems to be perfectly round.
Please tell me. I'm very sad for this thing. :".

Added (1). And there's any way to fix it?

It probably won't affect image quality at all.
There's a simple way to find out, you know -- take some pictures with it and see.

There's a good possibility that your lens suffered hidden internal damage when you dropped it. Try taking a few pictures with it and if they don't look like ones taken with it before you dropped it then it will have to be serviced. In the back of your Owner's Manual there should be a list of Nikon Authorized Service Centers. You can call for an estimate of the repair cost.

NOTE: You will be 100% responsible for any repair costs because the Manufacturer's Warranty doesn't cover damage caused by abuse such as dropping the lens.

There's a way to have it repaired.

Contact Nikon so they can repair it for you. Abuse is not covered under warranty, but having Nikon do the repair will give you the best results.

As mentioned, there's a high probability that the elements within the camera could have been knocked out of alignment as well.

Call Nikon 800. NIKON-UX for help