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KMID : 1011420180230040477
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Journal of Korean Ophthalmic Optics Society
2018 Volume.23 No. 4 p.477 ~ p.484
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Objective Evaluation of Asthenopia Using Accommodative Microfluctuation in the High-Frequency Region
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Park Sun-Mi
Lee Hyun-Mee
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Abstract
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Purpose: To investigate the objective evaluation of accommodative asthenopia using the accommodative response and accommodative microfluctuation in the high-frequency region.
Methods: A total of 44 eyes of 22 subjects (mean age, 22.59±1.92 years) were included in this study. An automatic refractometer (Speedy-i K-model), Opto Ruler, and flipper were used.
Results: The equivalent spherical refractive power, amplitude of accommodation, and accommodative facility of the subjects were ?2.91±2.64 D, 9.83±1.32 D, and 14.6±3.47 cycles/min, respectively. When the change in accommodative stimuli was +0.50 D to ?3.00 D, the size of the accommodative response changed by 0.04 D to ?1.12 D. The size of the accommodative response to accommodative stimuli increased by 16.0?37.3%. The frequecy of accommodative microfluctuation increased to 58.16?62.83 dB as the amount of accommodative stimuli. When the accommodative stimuli were ?2.50 D and ?3.00 D, the accommodative microfluctuation in the high-frequency region increased by more than 60 dB. The greater the myopia, the more negative was the correlation observed between the amount of accommodative response and accommodative microfluctuation.
Conclusions: As accommodative stimuli increased, accommodative response, the frequency of accommodative microfluctuation increased. Therefore, the accommodative microfluctuation can be used to estimate asthenopia objectively. Accommodative microfluctuation can be useful for objectively evaluating accommodative asthenopia.
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KEYWORD
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Accommodative microfluctuation, Amplitude of accommodation, Accommodative response, Accommodative stimuli, Asthenopia
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