How to fix the blurred picture of Apple 6?

Apple's 6P photography has become blurred. The main causes of focus blur include the following aspects:

1, the light is blurred. It is suggested to change the angle, choose the angle with good light or turn on the flash.

2, the lens has stolen goods, just clean the lens.

3, the lens has scratches, so it is blurred, but the sapphire lens of Apple 6P will not have scratches unless it is a very sharp object. This situation can only be repaired.