How do you know that's not what's actually going on? You may be different, but when I wear glasses, they're sufficiently far from my eyes that imperfections are quite visible as localized phenomena. They're not in focus, but they're nowhere close to spread out over the entire visual field. Specks of dust show up as blobs of dust. Scratches show up as fuzzy lines.
I'm going to guess that the person you're replying to is sufficiently familiar with his glasses to know what he actually sees.
I'm going to guess that the person you're replying to is sufficiently familiar with his glasses to know what he actually sees.