| Without enough experience, some people may | | | | neither view clearly distant objects nor nearby |
| wonder what progressive eye glasses are. First of | | | | materials. Progressive spectacles are a special |
| all, they belong to prescription spectacles which | | | | solution to this problem. Single vision glasses are |
| are used to deal with vision defects. Living in the | | | | surely no longer feasible. Before the invention of |
| modern society, an ordinary individual is quite likely | | | | multifocal eyeglasses, individuals with presbyopia |
| to suffer nearsightedness at a certain age. | | | | had to keep two different pairs of single vision |
| Excessive eye use during school years is the | | | | spectacles and switched between them on a |
| common reason for myopia. In most cases, eye | | | | regular basis. It was quite inconvenience to |
| care practitioners would advise young patients | | | | frequently make such kind of changes. In the |
| with nearsightedness to wear a pair of | | | | modern market, such a concern can be resolved |
| prescription eyeglasses. With such a device, | | | | simply by wearing multifocal glasses. A pair of |
| normal vision can be temporarily restored. They | | | | multifocal glasses incorporates more than one |
| will still need to replace new lenses with a high | | | | power in a lens. Progressive glasses are actually |
| power. In fact, these prescription glasses solely | | | | only one of the three categories of multifocal |
| for nearsightedness are classified into the single | | | | glasses. The other two categories are bifocals and |
| vision category. Before age 40, it is enough for | | | | trifocals. It is easy to understand bifocal glasses |
| most individuals to use single vision glasses. But | | | | and trifocal glasses. The first type refers to |
| after such an age, the situation will probably | | | | glasses with two different powers equipped in a |
| change. Presbyopia usually starts to develop in | | | | single lens. And a trifocal lens has three powers or |
| folks in their 40s. This vision problem caused by | | | | focal points. Progressive eye glasses are more |
| natural aging in the eyes is associated with the | | | | implicit that it is impossible to figure out the |
| decreased ability to focus close up objects | | | | number of focal points in a lens. Actually, a |
| properly. Presbyopic patients usually have to hold | | | | progressive eyeglass lens has no permanent |
| newspapers or books at an arm’s distance. | | | | amount of powers. They are called progressive |
| This is the most typical symptom of presbyopia. | | | | lenses because different powers change |
| Yet what is the function of progressive eye | | | | progressively in a lens. Unlike a bifocal lens or a |
| glasses? Patients having both nearsightedness and | | | | trifocal lens, a progressive lens can offer |
| presbyopia are really unfortunately that they can | | | | progressive and natural vision correction. |