| In the modern society, there are so many people | | | | things in the distance by seeing through the upper |
| who need to wear prescription eyeglasses or | | | | section. And objects that are close up can be |
| contact lenses. Another point is that many jobs or | | | | viewed by utilizing the lower part of the lenses. |
| sports require the use of safety eyeglasses. This | | | | Nowadays, most manufacturers of these glasses |
| can be testified by the cases of eye injuries | | | | only produce lenses with diopters ratings of plus 1 |
| occurring every day worldwide. As the public | | | | to plus 2.5. And lenses outside of this range will be |
| enjoys a longer life span, many people in their 40s | | | | extremely expensive and will be provided on a |
| and 50s still remain in their jobs. However, the | | | | customized basis. |
| traditional problem called presbyopia is sometimes | | | | Since progressive bifocal safety glasses are |
| unavoidable. In this sense, this group of people | | | | supposed to offer multiple functions and are |
| needs both presbyopia correction and eye | | | | relatively expensive, they are necessary especially |
| protection when they are involved in a dangerous | | | | for some groups of people. The first group is |
| activity. Bifocal and progressive bifocal safety | | | | presbyopic patients with jobs involving the |
| glasses are the perfect solution for these people | | | | operation of heavy equipment or materials that |
| with special needs. Traditional bifocal safety | | | | are hazardous to the eyes. These people need |
| glasses and progressive ones can both meet | | | | their eyes well protected from objects in the |
| these two requirements, even though they are | | | | workplace. The second group is presbyopic people |
| slightly different in lens design. | | | | enjoying hunting or shooting. They need to read a |
| Progressive safety eyeglasses can offer smooth | | | | map frequently in some cases. |
| power transition for patients who need vision | | | | C: Progressive bifocal safety glasses are needed |
| correction at various distances. Using bifocal | | | | especially by some groups of people. Presbyopic |
| safety glasses, it is no longer necessary to | | | | patients with a job involving heavy equipment or |
| remove or reposition the glasses in order to | | | | hazardous materials and those enjoying hunting or |
| focus on distant objects. Progressive bifocal | | | | shooting are potential targets. |
| safety glasses enable the wearers to perceive | | | | |