Recent years, high technology progressive lens glasses become more popular, and an increasing number of people who are in need of near vision help are turning to the progressive lenses for their vision needs. Nowadays, a large number of both the children and the old people are bothered by many different kinds of vision problems. However, visual refractive errors are quite common even among kids. Modern children tend to suffer problems at their earlier age. Generally speaking, there are three type of vision refractive errors, they are nearsightedness, farsightedness and astigmatism. Each of them has different symptoms.
Nearsightedness usually causes people unable to see distance objects clearly. Farsightedness acts in an opposite way that farsighted individuals have disability to see close up things clearly. Considerably different, patients with astigmatism can’t focus a point object into a sharp focused image on the retina. And another vision problem is presbyopia, which deprives old individuals’ normal near vision. While all these visual conditions are quite disappointing, there are fortunately various remedies. The most conventional remedy is using prescription eyeglasses. Within this category, there are still several types according to different lens powers. Based on the number of eyeglass lens power, there are mainly single vision glasses and multiple vision glasses. Progressive glasses are quite special belong to the latter type.
Why progressive glasses are popular these years? Is there any advantage about these progressive glasses? The answer is yes. Even though, there is an advanced eye surgery which is called laser. This technology cures a common vision problem, some people are advocating this. However, the corrective eyeglasses are becoming much more powerful. The first pair of prescription eyeglasses was very likely invented to deal with nearsightedness. This is quite reasonable that corrective glasses in old days were simply single vision ones, which means that each pair could resolve only one kind of refractive error. What is the situation nowadays? While single vision glasses remain as the majority, multiple vision glasses continue to accumulate popularity. The basic concern lying behind is that more and more people are suffered from more than one vision problem. Among the people over 40 years old, presbyopia is quite common. For these people, single vision glasses are no longer effective if they still have nearsightedness. Bothered by both myopia and presbyopia, it is necessary to wear glasses capable of correcting both of the two problems. This kind of prescription glasses can be called multiple vision glasses. But in exact, they are bifocal eyeglasses. There are still trifocal eyeglasses which have three focal points, with a third one dealing with intermediate vision zone. However, these bifocal or trifocal eyeglass lenses usually have visible lines on them, which set obvious boundaries. Progressive glasses are so great that they are equipped with no visible lines. Vision correction is also smoother.
After reading this article, you will find progressive glasses is a wonderful type of prescription glasses lens, your life will be more convenient by wearing progressive glasses. It is your best choice.
