The correct option is B cornea
When dust falls into your eye, make sure not to rub it as it may scratch and damage your cornea. The cornea's main function is to retract, or bend the light. The cornea is responsible for focusing most of the light that enters the eye. But deep scratches to cornea can cause infections, scars, and other problems. If you don't take care of them, they can lead to long-term vision problems. Report any unusual symptoms, including a return of pain after treatment, to your eye doctor.