The biggest side effect of controlling myopia with Ortho-K lenses is actually a benefit, namely there are no lenses to be worn during the day, during which time vision remains clear.
You might experience glare and halos that will be reduced with time, but may never completely go away. As with LASIK, patients with large pupils are especially susceptible to this.
The greatest potential adverse risk for any contact lens patient is infection. Patient’s compliance is of utmost importance. If you properly care for your eyes as instructed, the risk of infection or adverse effects are very low. Parents are recommended to supervise young children in the insertion, removal and care of their lenses.