This was a randomized , interventional , double-masked , single-center crossover study assessing balafilcon A silicone hydrogel contact lenses , bilaterally , straight from the blister pack solution ( control ) and pre-soaked in the following lens care solutions : Regard ( ) ( containing sodium chlorite ) , ReNu ( ) ( containing a PHMB [ polyhexamethylene biguanide ] derivative ) , CyClean and MeniCare Soft ( both containing PHMB ) .