Journal of the American Optometric Association · 1997
Prescribing for the moderate-to-advanced ametropic presbyopic VDT user. A comparison of the Technica Progressive and Datalite CRT trifocal.
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Butzon S P, Eagels S R
Аннотация
BACKGROUND: Use of video display terminals (VDTs) is expected to dramatically increase. This clinical study was performed to examine the moderate-to-advanced ametropic presbyopic VDT user to determine the most prevalent visual or physical symptoms incurred while working at a VDT, and to develop a comparative benefit analysis of two currently available occupational lens designs.
METHODS: Twenty-four symptomatic VDT users who were currently wearing a non-occupational lens design were selected from a pool of 100 applicants. The non-occupational lens distribution included 17 bifocals, 3 trifocals and 4 progressives lenses. The subjects compared two occupational lens designs.
RESULTS: Statistical analyses indicated that the frequency and severity of seven of 10 symptoms reported were significantly reduced by wearing the occupational lenses, including the three most frequently reported pre-existing symptoms of neck/shoulder aches, eyestrain, and blurred intermediate vision.
CONCLUSION: Study results suggest that symptomatic moderate-to-advanced ametropic presbyopic VDT users may benefit from an occupational progressive lens when work involves prolonged or exclusive viewing of a VDT screen. An occupational trifocal may benefit VDT users also required to perform other viewing tasks.
METHODS: Twenty-four symptomatic VDT users who were currently wearing a non-occupational lens design were selected from a pool of 100 applicants. The non-occupational lens distribution included 17 bifocals, 3 trifocals and 4 progressives lenses. The subjects compared two occupational lens designs.
RESULTS: Statistical analyses indicated that the frequency and severity of seven of 10 symptoms reported were significantly reduced by wearing the occupational lenses, including the three most frequently reported pre-existing symptoms of neck/shoulder aches, eyestrain, and blurred intermediate vision.
CONCLUSION: Study results suggest that symptomatic moderate-to-advanced ametropic presbyopic VDT users may benefit from an occupational progressive lens when work involves prolonged or exclusive viewing of a VDT screen. An occupational trifocal may benefit VDT users also required to perform other viewing tasks.