Can anybody blow or rub singled out limbs of his body after reciting certain surahs in a singled out time? i.e. can anybody after reciting surah Ar-Rahman blow into his eyes with a belief that it will increase his eye sight? And after concluding Fard salah can he put his palm over his head and recite 'ya qawiyo ya matino' or something like that? are these bid'a?