The white part of your eye is a tough, strong wall. Long, thin builder cells make the fibers that hold it together.
Drag to turn it around. Use the buttons to zoom in and try things from the lessons.
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The sclera is the white of your eye. It wraps almost all the way around the eyeball, like the hard shell of an egg, but it's tough and a little bendy.
Scleral fibroblasts are long, thin cells that live between thick bundles of fibers. They are the builders that make those fibers.
The cells make collagen, a strong, rope-like protein. The bundles crisscross in all directions, so the wall is very hard to tear.
Look in a mirror and move your eyes left and right. Muscles attached to the sclera are pulling your eyeball around! Then press Build fibers on the 3D model.
The sclera looks white because its fibers are jumbled. Light bounces off them in every direction, like light on snow.