What part of the eye directs light rays entering your pupil to the back of the retina?

The lens is the transparent structure located behind the iris and pupil that plays a crucial role in focusing light rays onto the retina, the light-sensitive layer at the back of the eye. When light enters the eye through the pupil, it first passes through the cornea, which is responsible for some initial focusing. However, the lens fine-tunes this focus by changing its shape, allowing for adjustments based on whether the object being viewed is close or far away. This process is known as accommodation.

The lens works together with the cornea to ensure that images are clearly focused on the retina, enabling us to see clearly. Therefore, its function is essential for directing light rays accurately to the back of the eye, which is crucial for proper vision. This makes the lens the correct answer to the question.