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Light enters the eye through the . After passing through the cornea, light enters the . the then expands or contracts depending on the amount of light. the light passes through the depending on what you are focusing on, the Relax or contract. when did cornea and lens refract, an upside-down image is formed on the . The and cones help change the image on the retina into signals that travel to the along the short nerve called the The optic nerve combines the images from both of your eyes into a single three-dimensional image. your then interpret the signals as an upright image.