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> Bifocal safety glasses - grey poly lens +3.00 diopter
Bifocal safety glasses - grey poly lens +3.00 diopter
* SB-9000 is available in clear lenses and five bifocal strengths: 1.0C, 1.5C, 2.0C, 2.5C and 3.0C.
Determine the reading power you need!
Determine smallest text that can be read with some difficulty from a distance of 14 inches from the bridge of your nose.
If you have difficulty reading this line, you need ....
