Check if the camera captures a clear image. A blurry image may be caused by dust accumulation on the camera lens or week light. If the image is not clear, clean the camera lens and the camera light with a piece of soft cloth. Also, due to the qualities of polycarbonate which is used to synthesize the lens, you should use PH neutral detergent or water to clean the lens and avoid scraping it.
If the light is still week, the camera light may be broken. Maintenance or replacement by professional personnel is required. If the light is bright, but the camera capture image is still blurry, the camera may be broken. Maintenance or replacement by professional personnel is required.