In the first place, progressive lenses glasses, which are featured by the gradient of increasing lenses power, can correct the presbyopia and other related eye disorders. The lenses can be divided into two parts -- the upper part corrects the myopia while the lower part controls farsightness. But unlike the bifocal lenses, there is no clear demarcation of the lenses and what the very glasses have stressed is the gradient of vision correction. So the wearers will feel totally comfortable when they need to accommodate the vision from far distance to the near place, all they need do is to see the object from the upper side of the lenses to the lower side.
What’s more, at the different viewing points, what the wearers have to do is to choose the suitable place of the lenses to see a thing in a certain distance, and according to the movement of that thing, they can move around their eyes to the head or bottom of the lenses, which is more convenient than preparing more than one glasses. The only one pair of progressive lenses glasses is enough to have all directional vision of the sight.
Last but not the least; compared with bifocal glasses, the progressive lenses glasses avoid the discontinuities in the visual field. The wearers can only make a small adjustment to look up and down to see the object both in the far and in the near place, and there is no cut between their visions so that you will feel it natural to have a good vision of the object.
To sum up, progressive lenses glasses are magical invention since then. If you are misfortunately diagnosed with some eye disorders, progressive lenses glasses may be your deliverer of life.