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KMID : 1159320160180030361
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Korean Journal of Vision Science
2016 Volume.18 No. 3 p.361 ~ p.368
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A Study on the Change of Positive Vergence and Accommodative power according to Illumination
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Jeon In-Chul
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Abstract
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Purpose: The purpose of this study is to investigate changes of positive vergence and accommodative power with illumination.
Methods: 49 subjects(mean age:24.51±2.82) having no systemic and ocular disease were recruited. Illuminance environment is going to use the light meter ((LX-101, Lutron, USA) and dimmers to change the light intensity from 10 lux to 1000 lux measured the amplitude of accommodation and far/near positive vergence.
Results: Amplitude of accommodation was lowest to 8.51 D with 10 lux and the highest to 9.12 D with 800 lux. As the illuminance increases, the exponential decay fit(y=9.09-0.62e- ) was maintained while also increasing amplitude of accommodation. Break point of distance positive vergence was higher by 20.81 △ at low illuminance of 10 lux, near positive vergence was higher by 21.42 △ at low illuminance of 10 lux. The exponential decay fit of Distance/near positive vergence were y=17.08+4.66e-and y=20.93+0.63e- respectively.
Conclusions: As the illuminance increases while amplitude of accommodation is increasing, Distance/near positive vergence was increase in low light, while temporarily reduced while increasing illuminance showed a pattern that changes less.
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KEYWORD
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illumination, accommodative power, vergence, convergence, positive fusional vergence
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