| After hundreds of years' progression and | | | | goggle eyewear. While vision correction brought |
| advancement, the eyewear world has been filled | | | | by traditional prescription spectacles is simple, its |
| with a very huge variety of eyeglass types and | | | | combination with eye safety ensured by goggles |
| associated styles. According to functional | | | | involves more complex design and manufacturing |
| complexity, all types of eyeglasses can be | | | | process. Over the years, prescription goggles |
| classified into two groups. Each pair within the first | | | | have helped lots of athletes in fields like motor |
| group offers a single form of vision correction or | | | | cycling protect their eyes while seeing distance |
| eye protection. And the other group contains lots | | | | objects in the surrounding environment clearly. |
| of types of eyewear products that provide | | | | A common point among most of the |
| multiple functions. Bifocal safety glasses fall into | | | | combinational eyewear products is that they |
| the latter group. There are similar eyewear | | | | usually take vision correction as a necessary part. |
| designs or products that have been invented or | | | | This is also true for bifocal safety glasses. Its |
| developed in a combinational way. The | | | | name suggests obvious functionalities provided by |
| fundamental approach to such kind of innovation is | | | | this type of spectacles, in quite a similar way as |
| to combine different functions provided by those | | | | prescription sunglasses or prescription goggles do. |
| designs belonging to the first group together. For | | | | Bifocal safety reading glasses will basically provide |
| instance, prescription sunglasses have been | | | | both "bi-vision" correction and eye safety ensuring. |
| brought into existence by those who simply | | | | It is clear now that vision correction is also a |
| combined the function of vision correction offered | | | | necessary element in these eyeglasses. |
| by regular prescription glasses and UV protection | | | | Compared with regular prescription goggles, bifocal |
| enabled by traditional sunglasses. | | | | safety reading glasses do offer extra benefits. |
| Another comparable example to bifocal safety | | | | C: Bifocal safety glasses made with a unique |
| glasses is prescription goggles. This creative entity | | | | design combine the function of vision correction |
| incorporates both the function of regular | | | | and the functionality of eye protection. They do |
| prescription eyeglasses and the functionality of | | | | more work than prescription goggles. |