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Graefe's Archive for Clinical and Experimental Ophthalmology

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01-07-2021 | Pediatrics

Accommodation and binocular vision changes after wearing orthokeratology lens in 8- to 14-year-old myopic children

Authors: Yutong Song, Shenlin Zhu, Bi Yang, Xue Wang, Wei Ma, Guangjing Dong, Longqian Liu

Published in: Graefe's Archive for Clinical and Experimental Ophthalmology | Issue 7/2021

Abstract

Purpose

The study aimed to observe and analyze the dynamic accommodation and binocular vision changes in myopic children after they switched from spectacles to orthokeratology (ortho-k) lenses.

Methods

Thirty-six myopic children aged 8-14 years were enrolled in this prospective, self-controlled study from West China Hospital. General information was gathered, and examinations were performed at baseline and at 1, 3, 6, and 12 months after switching to ortho-k lenses. The examination included assessments of distance/near visual acuity, distance/near horizontal and vertical ocular alignment, distance/near horizontal vergence range, accommodative amplitude, monocular/binocular accommodative facility, accommodative response, positive and negative relative accommodation (PRA/NRA), accommodation convergence/accommodation (AC/A), stereopsis, and reading ability.

Results

After the children switched to ortho-k lenses, distance and near ocular alignment showed an exophoric shift (distance: p = 0.001, near: p = 0.002), and the horizontal vergence range decreased by different degrees (convergence: distance blur point (p = 0.002), distance break point (p = 0.005), near blur point (p = 0.011), near break point (p = 0.043); divergence: distance break point (p < 0.001), distance recover point (p < 0.001), near recover point (p = 0.005)). The stereopsis ability (p < 0.001), monocular/binocular accommodative facility (p < 0.001), and PRA (p = 0.010) increased. The accommodative lag (p < 0.001), accommodative amplitude (p < 0.001), and calculated and gradient AC/A (calculated: p = 0.001, gradient: p = 0.025) decreased. The adjusted horizontal and vertical reading times and their ratio decreased (all p < 0.001).

Conclusion

The subjects showed distance and near exophoric shifts after switching to ortho-k lenses; improvements in accommodative function, stereopsis, and ocular motility; and a decrease in the binocular horizontal vergence range. The relationships between these changes and the ortho-k myopic control effects require further investigation.

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Title: Accommodation and binocular vision changes after wearing orthokeratology lens in 8- to 14-year-old myopic children
Authors: Yutong Song
Shenlin Zhu
Bi Yang
Xue Wang
Wei Ma
Guangjing Dong
Longqian Liu
Publication date: 01-07-2021
Publisher: Springer Berlin Heidelberg
Published in: Graefe's Archive for Clinical and Experimental Ophthalmology / Issue 7/2021
Print ISSN: 0721-832X
Electronic ISSN: 1435-702X
DOI: https://doi.org/10.1007/s00417-021-05106-2

At a glance: The STEP trials

Springer Medicine

Accommodation and binocular vision changes after wearing orthokeratology lens in 8- to 14-year-old myopic children

Abstract

Purpose

Methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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