印刷会社のVDT作業者に認められた視力変化

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A yearly ophthalmological examination was carried out in 2 VDT worker groups (A-1 and B-1 groups) and 2 control groups (A-2 and B-2 groups). The 4 groups were as follows; workers routinely engaged in both VDT work and key-punch work at a printing company (A-1 group), researchers or office workers handling VDT irregularly at a chemical company (B-1 group), typesetters at a printing company (A-2 group), and office workers at a chemical company (B-2 group). The examination was commenced in the same year in which the workers of A-1 or B-1 group were introduced to VDT work and was carried out for 3 years. Comparison between the first and the last examination on subjective refactive power showed that all the groups had lower refractive powers in the last examination than the first one. The workers of A-1 group showed the greatest decrease in refractive power among the 4 groups. The decrease in A-2 group was more severe than in the other 2 groups. Before VDT introduction, the workers of A-1 group had been engaged only in key-punch work. Information on naked visual acuities of A-1 group 3 years before VDT introduction was also obtained and compared with those in the first and the last examination. The ratio of workers with a severe reduction in visual acuity evidently increased after VDT introduction. In the first examination, accommodative powers of workers at the printing company were lower than those of workers at the chemical company irrespective of VDT work, and most ophthalmological subjective symptoms were observed in workers of A-1 group. However, no changes in accommodative power or in the number of the subjective symptoms were observed between the first and the last examination in the all groups. These results indicate that 1) VDT work may be associated with the decline in visual acuity among workers of A-1 group; 2) key-punch or typesetting work at the printing company involved more visual burden than irregular VDT work in the chemical company; and 3) engagement in work of visual nature other than VDT work is an important factor in the establishment of guidelines for VDT work.
社団法人日本産業衛生学会の論文
1991-11-20

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