Hey I have Keratoconus too..
I am using the K-Rose lenses RIgid Gas Peremable ones, they are quite comfortable after a week of use. The K-Rose lenses are engineered to exact curvature of the problematic cornea, so the fit is perfect and no accumulation of tears inderneath
Overall, though bit expensive I would say they helped.
If you want to serve even feature phones, of if the notifications should arrive even not connected to internet then SMS is best. But, consider the cost aspect too...