Accommodative near point of 68 healthy subjects, who had no special eye conditions, were measured in order to clarify their distribution form and thus to select a measure that is suited to the continuous observation of visual fatigue of VDT workers.
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Accommodative near point of 68 healthy subjects, who had no special eye conditions, were measured in order to clarify their distribution form and thus to select a measure that is suited to the continuous observation of visual fatigue of VDT workers.
The results were as follows:
1. Both near point(appear) and near point(disappear) followed normal distribution only after natural log-transformation(Shapiro-Wilk test).
2. The variance and the coefficient of variation of near point(appear) were 0.07 and 5.19, respectively, while they were 0.14 and 7.58 in near point(disappear). The finding suggested that near point(appear) could be a preferable measure to near point(disappear) in the sequential monitoring of visual fatigue.
3. A stepwise multiple regression analysis showed that the variance of near point(appear) was most significantly explained by age, which was followed by glass-wearing and sex in the order of sequence. On the other hand, the variance of near point(disappear) was most significantly explained by age as well, which was, however, followed by sex only.