How Does Contact Lenses Work?
Firstly they stick to the eye because of suction. The inner curve matches that of the eye cornea which makes a good seal. Secondly, often visual errors such as astigmatism are due to errors in the shape of the cornea. In this case, when the contact lens is in the eye any gap between it and the cornea is filled with liquid. This smooths out any cornea errors. Thirdly, the front curve is set to give a specific power. This adjusts for any natural lens focus errors that the user may have.
