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KMID : 1011420210260010035
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Journal of Korean Ophthalmic Optics Society
2021 Volume.26 No. 1 p.35 ~ p.43
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Refractive Error Changes with Accommodation and Its Component Occurring by Near Vision조절성 굴절이상 변화, 반사성 조절, 폭주성 조절, 근접성 조절, 파워벡터
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Jung Su-A
Kim Gi-Chang
Kim Hyun-Jung
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Abstract
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Purpose: This study investigates refractive error changes with accommodation, as well as a component of refractive error changes with accommodation occurring by near vision.
Methods: Distant (5 m) and near (40 cm) refractive errors were measured using an open-view autorefractometer (N-Vision K-5001, Shin-Nippon, Japan). In the case of a near refractive error, the changes with accommodation caused by near vision were assessed after correcting the change in the refractive power by the amount of accommodative stimulus. The amount of vergence accommodation was calculated using the difference values of the near refractive error measured with the near vison chart placed in the center of the binocular eye and in front of the monocular eye. The amount of reflex accommodation including proximal accommodation, was calculated by the difference between the amount of refractive error changes with accommodation and vergence accommodation. The power vectors (M, J0, J45, B) were applied and analyzed.
Results: Refractive error changes with accommodation occurring by near vision, vergence accommodation, and reflex accommodation including proximal accommodation, respectively, changed spherical power (S) into ?1.54±0.58 D, 0.01±0.37 D, and ?1.55±0.53 D, cylinder power (C) into ?0.31±0.59 D, 0.41±0.71 D, and ?0.72±0.84 D, axis (Ax, θ) into 5.18±83.74°, 13.18±69.58° and ?8.00±79.41°, M into ?1.69±0.70 D, 0.21±0.55 D, and ?1.91±0.77 D, J0 into 0.13±0.26 D, ?0.17±0.29D, and 0.31±0.43 D, J45 into 0.01±0.16 D, 0.08±0.22 D, and 0.03±0.16 D and B into 1.72±0.55 D, 0.56±0.44 D, and 1.97±0.81 D.
Conclusions: A prescription should be considered since refractive error changes with accommodation may occur due to near vision. The vergence accommodation occurred due to the intervention of convergence when looking at near distance, and refractive error changes with accommodation demonstrated a large change by reflex accommodation including proximal accommodation, among the accommodation components.
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KEYWORD
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Refractive error changes with accommodation, Reflex accommodation, Vergence accommodation, Proximal accommodation, Power vector
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