Answer: Cornea
Step-by-step explanation:
The cornea is that region of eye that allows the light to enter the eye. It acts as a protective covering.
The iris is that region of the eye that expands and contracts in order to that right amount of the light enters the pupils. The pupil is very sensitive towards light and its size changes according to the intensity of the light.
The light is directed inside the eye by the pupils to the lens inside the eye.