You stick it in your eye, but do you know where it came from?
Contact lenses have been around for more than 100 years and a lot has changed since they were invented.
Soft lenses (which are what almost everyone wears nowadays) are made from these hard poly hema (aka plastic) discs.
A computer controls a lathe that cuts the disc down to size based on the prescription strength.
The machine spins at 6,000 rotations per minute and uses an industrial diamond to shape the inner curvature (the part that touches your eye).
Then, they polish the lens with this spinning machine and an abrasive paste.
No sharp edges, please.
To make the outside curve, they coat the whole thing in this weird brown wax.
IDK, science.
