question: What is the membrane lining the back of the eye called?
distractor3: aperture
distractor1: lens
distractor2: cornea
correct_answer: retina
support: The retina is a membrane lining the back of the eye. The retina has nerve cells called rods and cones that change images to electrical signals. Rods are good at sensing dim light but can’t distinguish different colors of light. Cones can sense colors but not in dim light. There are three different types of cones. Each type senses one of the three primary colors of light.