| Like bifocal safety glasses, trifocal safety glasses | | | | distance things can hardly get satisfied. Safety |
| are a type of combinational product. Bifocal safety | | | | eyeglasses with a trifocal design are more |
| glasses are made of lenses that have a reading | | | | powerful than those bifocal ones. As the name |
| prescription in the lower part and no power in the | | | | implies, trifocal safety reading glasses also |
| upper section. While users can get reading aid | | | | combine eye protection with multiple forms of |
| from bifocal safety reading glasses, their distance | | | | vision correction. Even if these two categories are |
| vision will stay uncorrected. As a result, these | | | | different in some aspects, they both provide |
| glasses are particularly suitable for people with | | | | those two benefits. One is eye safety guarantee |
| presbyopia only. Those having difficulty in seeing | | | | and the other is vision correction. |