[Experimental studies on the influence of astigmatism on eye accommodation]

We studied the influence of astigmatism on eye accommodation by means of a cathode ray tube (CRT) screen as a visual display terminal. Experiments using an infrared optometer and personal computer showed that artificial astigmatism over 1 diopter induced effects in the visual accommodation system of subjects in their twenties, decreasing the contraction velocity of accommodation, prolonging the settling time of accommodation and increasing the amplitude of accommodative fluctuation. Even if the visual acuity is fairly good with mild astigmatism, astigmatism need to be corrected for preservation of eye accommodation for VDT work in the young age group.