What is Far and Close?

Another important point to remember is to realize that far and close are subjective and not absolutes. They are different for people with impaired vision. 10 inches is considered close distance for normal or presbyopic person. If I can’t see clearly at 10 inches, is 10 inches far? In order for me to strain to see close the book should be very, very close to my eyes, uncomfortably close. I don’t want to do it because I am convinced that there is something going for near-point stress theory and I don’t want to make my lens thicker than it is. I want to make it flatter and the only way to do it is to look at the distance.