Not sure if 20-30 mins of discussion is necessary for my case, but my case was simple. When the new prescription glasses arrived, the nose pads are not properly adjusted, resulting in the glasses sitting too high on my face. This means I'm looking through the bottom portion of the lens. This makes things blurry and causes headaches. Fortunately once the problem is noticed, it takes one minute to fix.
I'm amazed at how often I see people with poorly adjusted nosepads. In some cases I can see one or both pads not sitting flush on the nose, but digging in at an angle.
