The front of your eye is filled with a clear, watery fluid. Pale cells on a ring of tissue behind the colored part of your eye make it.
Drag to turn it around. Use the buttons to zoom in and try things from the lessons.
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Behind the colored part of your eye (the iris) is a ring of tissue called the ciliary body. Its surface has many small folds.
The folds are covered by two layers of cells. The inner layer is pale, with no dark color. That's these cells. The layer under them is dark brown.
Tiny threads stretch from here to the lens and help hold it in place.
These cells make a clear, watery fluid called aqueous humor. It fills the space between your cornea and your lens.
Press Make eye fluid on the 3D model to see fluid flow out of these cells.
Humor is an old word for a body fluid. So aqueous humor means "watery fluid," not a funny joke!