90% of the time when in the water my mask is on my face....it is Rx lens.....I do lift it at time on in water breaks or surface swims to blow snought out of my nose. In calm water during in water surface time I do place my mask on my forehead....no big deal. Now in rough waters I will not do this. But if a diver wants to place his mask on his forehead under normal conditions I see no problems with it! I could go on and on about all the reasons for or against this...but the fact of the matter is do what is best for you...not because someone else said you had to do it a particular way or your wrong.