If you have never worn progressive no-line bifocal reading glasses you should know that the clear reading area is in the center of the lenses. If you try to look through the sides (edges) of the lenses your vision will be blurred. Please read below:
I am not an optician. I don't manufacture glasses. I will try to address some of the questions about noline progressives as best I can:
(1)The bottom is your reading diopter or magnification(close up approximately 12-14 inches or the distance most comfortable for reading). The top (usually the top half) is clear. The magnification in between progresses from clear (0.00) to your reading diopter or magnification. Some people are helped with near vision (several feet away) as well. Others are not. Obviously progressing from 0 to +1.00 will give you more in between visability than 0 to +2.50. Many people have said they help in viewing the TV approximately 10 feet away as well as reading.
(2)The distance from the center of the reading glass area in the right lense to the center of the reading area in the left (called PD by opticians) is 62mm or approximately 2 7/16". This is a good average distance for the majority of the public; however, one size doesn't fit all. There is nothing we can do to help if you need a wider or narrower PD.
(3)If you need correction in the lenses for say an astigmatism, you will have to get your glasses made by first obtaining a perscription from your optometrist and then going to an optical lab. We will not be able to help you.
(4)A great number of curves are present in the lens in order to achieve the progression from one area of focus to the next. These curves are graduated vertically in the center and brought out to the sides of the lenses to be "blended" together. Although most of that blended area is eliminated when the lenses are cut down to fit the eyeglass frame, the side areas that remain do not provide the best vision.
(5)There is a short adaptation period when you are fitted with your first pair of progressive lenses, which can range from a few minutes to a few weeks. People with certain types of corrections, including strong plus (also called strong farsighted or high hyperopic) prescriptions, tend to have more difficulty adapting to progressive lenses.