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KMID : 1011420090140020009
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Journal of Korean Ophthalmic Optics Society
2009 Volume.14 No. 2 p.9 ~ p.14
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A Study on the Changes of Accommodative Function in Respect to the Viewing Angle
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Lee Hark-Jun
Kim Jung-Hee
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Abstract
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Purpose: The purpose of this study was to examine the relationship between the accommodative facility, blink rate and accommodative lag according to the change of angles of main viewpoint of near distance worker and study an appropriate viewing angle that mitigates asthenopia, such as headaches or eye fatigue accompanied when reading and staring at the computer or TV for a long time.
Methods: Total of 27 people including 12 male university students and 15 female university students in the age of 20 to 36 with frequent near distance works, such as computers, were selected to study the accommodative facility, the blink rate and the accommodative lag in accordance with the change of viewing angles of the near distance workers. The refraction error was corrected completely and the phoropter was shifted to near distance mode to locate the near distance indication at 40 cm. The accommodative facility and the blink rate were measured for one minute at each viewing direction of 40o downward, 20o downward, horizontal, and 20o upward directions based on the horizontal line and the accommodative lag was measured in dynamic retinoscopy using retinoscope.
Results: As a result, when the main viewpoint was moved on upper direction from the 40o below, the accommodative facility was reduced and the blink rate and the accommodative lag were increased so their eyes became dry and the accommodation response was reduced.
Conclusions: In near distance works, the eye fatigue level can be minimized by locating a book or a computer screen 40o below than the horizontal direction.
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KEYWORD
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asthenopia, accommodative Lag, accommodative facility, viewing angle, blink rate
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