Which part of the eye enables adjustment to low-light conditions?

Explanation

Rod cells are specialized photoreceptors in the retina that allow the eye to adapt to dim lighting, enabling night vision. Cone cells function in bright light and color detection. The iris controls the size of the pupil, which regulates light entry but does not directly manage dark adaptation. The pupil is the opening through which light passes, and the cornea is the eye's outer protective layer.