Final answer:
Rods are the cells in the retina that are primarily responsible for night vision as opposed to day vision.
Step-by-step explanation:
The cells in the retina that are primarily responsible for night vision as opposed to day vision are rods.
Rods are more sensitive than cones and are solely responsible for peripheral vision and vision in very dark environments. They are also important for motion detection. Rods do not yield color information, so in very dark conditions, you lose color vision but retain the ability to discern grey scales.