Dome camera went blur in night vision


I brought a box of set system NVR 500GB HD with two dome and two regular camera. Two of the dome camera cannot get a night vision working right from the first install. It came out the picture blur white out by the IR ( I think). In the daytime it works beautifully good.
Anyone can tell me how to resolve this problem?F13F00E5-B3C4-4881-96D7-8C3CDA2A4519


Check the mode and make sure it is set to auto.


I think it is the night vision mode the IR light reflected from the dome cover to the camera.
Anyone can tell me if it is correct?