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KMID : 1011420110160010075
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Journal of Korean Ophthalmic Optics Society
2011 Volume.16 No. 1 p.75 ~ p.81
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The Diurnal Change of Accommodative Functions by Near Work
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Lee Jeong-Yun
Yu Dong-Sik
Son Jeong-Sik
Cho Hyun-Gug
Moon Byeong-Yeon
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Abstract
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Purpose: The daily changes of accommodation at period 1 (08:00~10:00), period 2 (13:00~15:00) and period 3 (18:00~20:00) were surveyed with fifty two incipient presbyopia of from 38 to 49 years old.
Methods: 52 incipient presbyopia subjects (30 men, 22 women) were classified into 4 groups (groupI: 7 hrs~group IV: <3 hrs) according to near working amount. Their amplitude of accommodation, accommodative facility and relative amplitude of accommodation were inspected, respectively.
Results: The amplitude of accommodation was measured to be the lowest for the groupI that near working time was the most during daily work, and the amplitude of accommodation of oculus dexter, oculus sinister and oculus uterque were the highest at period 2 in case of all the group I~IV. In the accommodative facility, it appeared that the oculus dexter, oculus sinister and oculus uterque of group I, oculus dexter and oculus sinister of group II, and oculus dexter, oculus sinister and oculus uterque of group III were the highest at period 2. The oculus uterque of group II and oculus dexter, oculus sinister and oculus uterque of group IV were the highest accommodative facility at period 3. It appeared that the negative relative accommodation was the highest at period 1 in case of all the group I~IV, and the positive relative accommodation was the highest at period 2 in case of the group I~III and was the highest at period 3 in case of the group IV.
Conclusions: Because the difference of near working time affects the accommodation, it would become a help in solving the asthenopia symptom of the incipient presbyopia that opticians consider their near working time during daily work and take a checkup on their accommodation.
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KEYWORD
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Incipient presbyopia, Near work, Amplitude of accommodation, Accommodative facility, Relative accommodation
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