Eli5 How do contact lenses stay in correct position following your eye movement?
In: Technology
Your eyes aren’t actually perfectly spherical. The cornea bulges out slightly, and the contact rests on that bulge, so as your eye moves, so does the contact
As the other poster stated, the eyes aren’t spherical and lenses are also designed to sit at the front of the cornea, so even if you look left/right/up etc. the lens moves with the eye and generally recentres itself when you are looking ahead again.
Contact lenses for astigmatism also have a nearly imperceptible weight on the bottom to ensure it spins to the bottom to line up correctly 🙂
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