Patienter, som får et alvorligt synstab (svarende til 4 linjer eller mere) indenfor en uge efter behandling, bør ikke behandles igen, i det mindste ikke før synet er som før behandlingen, og den mulige risk/ benifit af efterfølgende behandling er overvejet nøje af den behandlende læge.
Patients who experience a severe decrease of vision (equivalent to 4 lines or more) within one week after treatment should not be re-treated, at least until their vision has completely recovered to pre- treatment level and the potential benefits and risks of subsequent treatment have been carefully considered by the treating physician.