The flatter the cornea, the harder it is to fit with conventional lenses. In the picture below, the cornea is so flat that only a scleral lens will restore vision. A soft lens simply assumes the shape of the irregular cornea. Conventional rigid lenses slide off.
https://sclerallens.com/wp-content/uploads/2014/10/flat-cornea.jpg 749 800 levi http://sclerallens.com/wp-content/uploads/2022/06/scleral-logo7-300x104.png levi2014-10-07 14:09:562014-10-07 14:09:56Conventional Lenses Slide Off This Flat Lasik Cornea