To the best of my knowledge, the cornea of your eye (the colored part that contains the iris) is convex, and bulges out from the rest of your eye. Contact lenses are contoured to the shape of your cornea, so they generally stay in the same place. However, the contact lenses can be pushed out of place if you rub your eye the wrong way or if they are dry and stick to your eyelid while blinking. Hope this answers your question and please correct me if i’m wrong.
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