ANSI Z80.1 2005 Standard has Two Important Changes
Change #1 – For all lens types, the tolerance on cylinder axis increased to 14 degrees for cylinder powers up to 0.25 diopters and seven degrees up to 0.50 diopters. In the 1999 standard these tolerances were seven degrees and five degrees. These new tolerances allow the visual blur, due to axis error, to be similar to the blur allowed by the traditional cylinder power tolerance of 0.13 diopters.
Change #2– the tolerance on refractive power for progressive lenses increased from 0.13 to 0.16 diopters. This recognizes the challenges presented by progressive addition lenses. The 0.09 diopter tolerance on the front surface set by the International Organization for Standardization (ISO) standards makes it difficult for labs to produce finished lenses meeting the 0.13 tolerance. In addition, the complex surfaces of these lenses make power measurement difficult.
Everyday an estimated 1,000 eye injuries occur in the North American workplace. While the financial cost is enormous, no dollar figure can adequately reflect the personal price paid by injured workers.
Not wearing eye protection is obviously dangerous, but most workers do not realize that wearing the wrong kind of eye protection can be just as hazardous.
This means government eyewear standards are required and must be appropriate for the specific hazard encountered.”Shop floor” education about safety eyewear is a must because injured workers who did not wear eye protection, usually say they thought protection wasn’t necessary.