Just like washing your hands, it’s good practice to clean your glasses regularly. A glasses cleaning solution that contains a surfactant will help to remove surface microbes that may be of harm. Make sure you clean them thoroughly, not forgetting the nose pads and sides, and dry them with a clean glasses cleaning cloth.
Once your glasses are clean, keeping them that way can be tricky, especially if you take them on and off throughout the day. If you do have to place your glasses down on a surface, make sure you clean your glasses again before putting them back on.
When putting your glasses on or taking them off, it is almost impossible to do so without touching your face. Make sure your hands are clean before doing so by washing them with soap and water.