Yes, you can. It will not harm the lenses as long as the rubbing alcohol solution is 70% or less anything higher runs the risk of rubbing coating off the lenses. Moreover, if your eyeglasses are added with coatings, you need to pay more consideration. Most high-quality antireflective coatings will not be damaged by rubbing alcohol, but some of the cheaper coatings (usually from chain retailers - JC Penney Optical etc) it is not a good idea. If the optician who sold you the lenses says diluted alcohol is safe, then go for it, since they know the quality of their lenses and coatings. Otherwise, to be cautious, you can pick up some of that commercially sold lens cleaner that specifies Alcohol Free or AR Safe. It's usually pretty cheap.