To date, the Schwind AMARIS laser is the only machine that is able to perform the no-touch TransPRK in a single step.

With any other laser machines in the market, at least 2 or 3 laser steps have to be performed. First, the epithelium is ablated, then the stroma is ablated to treat the refraction or ‘power’, followed by a third laser step to correct the change in power due to the first laser step. This was not only time consuming, but caused uneven epithelium and inaccurate results.