| Along the history of eyewear development, there | | | | users of bifocal safety glasses can only get visual |
| have been continuous technological improvements | | | | aids when they try to view nearby objects or |
| that have brought additional benefits to numerous | | | | materials. It is true that lots of people can benefit |
| users. For a long time, people have been thinking | | | | greatly from these eyeglasses, especially for |
| that bifocal safety eyeglasses are advanced | | | | those with occupations involving power tools |
| enough to provide such a combination of different | | | | operation. |
| functions. However, dual bifocal safety glasses | | | | However, those traditional bifocal safety glasses |
| say that this is absolutely not the end. From a | | | | are not sufficient enough when the wearers still |
| functional perspective, the invention of dual bifocal | | | | want to see objects in the distance. In fact, the |
| safety glasses has marked a significant | | | | combination of both nearsightedness and |
| advancement in the lens industry. This is similar to | | | | presbyopia correction is the typical function |
| some other cases. For instance, regular reading | | | | provided by regular bifocal reading glasses. Dual |
| glasses have been succeeded by bifocal reading | | | | bifocal safety glasses bridge well this gap, in a |
| glasses. And then progressive reading glasses | | | | similar way as regular bifocal reading glasses. The |
| have made a further step, compared with bifocal | | | | upper section of their lenses helps the user to see |
| reading glasses. The eyewear industry has | | | | distant objects and the lower section is for |
| witnessed other similar advancements. | | | | presbyopia correction. This powerful type of |
| Dual bifocal safety glasses are superior to | | | | eyewear product is extremely helpful for certain |
| traditional bifocal safety spectacles in the aspect | | | | groups of people. |
| of vision correction. As widely known by the | | | | C: Dual bifocal safety glasses provide |
| public, bifocal safety reading glasses can provide | | | | nearsightedness correction that is beyond |
| only vision correction within the near range. This is | | | | traditional bifocal safety eyeglasses. It is |
| because their lenses are made with a single, | | | | acceptable to say that these spectacles are more |
| positive power in the bottom section. The upper | | | | powerful. |
| portion is Plano or non-prescription. In this case, | | | | |