VDT作業者の眼疲労実態と対応

Present status and proposals for asthenopia in workers with visual display terminals (VDT)

　VDT作業者の眼精疲労の対応として，某事業所におけるVDT作業者と一般事務者のアンケート調査の分析を行い，さらにVDT作業者について，VDT作業用眼鏡（ODおよび＋0.5D加入）の実験的研究を行い検討した．

　アンケート調査においては，①VDT作業者は，一般事務者に比較し，いずれの疲労訴えにおいても，平均悪化率が高かった．②オペレーター，パンチャー，プログラマーの職種間の比較では，オペレーターが最も平均悪化率が高かった．

　また眼科的所見では，VDT作業者は一般事務者に比べ，調節弛緩時間が有意に延長した．

　装用眼鏡の影響については，調節弛緩時間では，＋0,5D加入群が有意に短縮していた．

　また色フリッカーでGreenの臨界隔合時間はOD群が有意に延長していた．

　さらにedge-light pupil cycle timeは＋0.5D，ODの両群とも，有意に短縮していた．

We evaluated the ocular fatigue and health com-plaints among workers using visual display terminals (VDT). A questionaire survey was conducted in 60 VDT workers and 45 clerical workers who served as control.

Questionaire studies showed a higher incidence of ocular fatigue in VDT workers than in controls. Among the 3 groups of operator, puncher and programmer, the first group complained of visual fatigue and asthenopia in a higher incidence than the other two groups.

Significant prolongation in relaxation time of accom-modation were found in VDT workers over clerical workers in the age range of 20 to 35 years when tested by accommodo-polyrecorder.

In another series of 22 VDT workers, prolonged wear of +0.5 D correction lenses for two weeks shortened the relaxation time of accommodation. This beneficial effect was absent in the control group.

When tested with color flicker test, VDT workers showed prolonged flicker fusion time for all color flickers compared with normal subjects. After continu-ous wear of +0.5 D lenses, VDT workers failed to show prolongation of flicker fusion time as observed in con-trols.

It is suggested that habitual wearing of +0.5 lenses would induce improvements in accommodation while engaged in VDT tasks.

Rinsho Ganka(Jpn J Clin Ophthalmol) 40(7) : 735-738, 1986