Last time I visited the optician, he put loads of lenses in those weird glasses things, one after the other. At last he came to a setting that just made the world come into sharp and clear focus. Everything spot on. So I told him these were perfect, and I could read every chart right through. The joy of that was, he then informed me that he'd just taken all the lenses out, and that was my unmodified vision. Not bad for 20 odd years of staring at monitors.. :) Malk