Batha (and others) misuse the word "focus" constantly. They should be using the word "concentrate" instead. Basically, at any distance beyond about ten feet our eyes are focused on whatever we are looking at and that is an optical, biological and physiological fact. However, that does't necessarily mean we are concentrating on what we are seeing. Big difference.

Last edited by btdtst; 09/07/15 09:54 PM.