Human Eye

See how sight works on this human eye coloring page. The large cross-section shows the round iris and pupil at the front, the curved lens just behind, the eyeball with the retina lining the back, and the optic nerve leaving toward the brain, all with blank label lines pointing to each structure. The big clear shapes make it friendly for a range of ages, while the labels turn it into a proper study tool for a senses unit. Here is a neat fact: the lens flips the image upside down, and your brain turns it the right way up without you ever noticing. Coloring the iris is the most fun part — make it any eye color you like, from brown to bright green or blue. Use different shades for the lens, retina, and optic nerve so light's path through the eye is easy to trace. Print it on US Letter or A4.