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trifocal

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
trifocal /tri·fo·cal/ (tri-fo´-) (tri´fo-k'l)
1. having three foci.
2. containing one part for near vision, one for intermediate, and a third for distant vision, as a trifocal lens.
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3 explains the better usage of monitor Bifocal and trifocal wearers have to pay particular attention to the placement of their monitor.
Study of Ergonomics in Computer Workstations by Isaac Patturaja.G.B / Health, general community
The close, the far off and the intermediate vision- all of these need correctives if you are using a trifocal lens.
Features of Trifocals by Suzanne Hughes / Business community
If you wear bifocals or trifocals, your monitor probably should be considerably lower than usual positions.
Ergonomic office equipment: pros and cons: there are benefits, and ... by Kind, Mike / New Hampshire Business Review
 
 
 
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