The diversified defocus profile of the near-work environment and myopia development
The diversified defocus profile of the near-work environment and myopia development
Purpose: To quantify the defocus characteristics in the near-work environment at home and investigate the relationship with subsequent myopia progression.
Methods: Fifty subjects (aged 7–12 years) were recruited and followed for 1 year. The home near-work environment (writing desk) was measured at a baseline home-visit using the Kinect-for-Windows to capture a 3-dimensional image. The depth values of the image were then converted into scene defocus with respect to the subject’s viewpoint. The defocus characteristics were quantified as the dioptric volume (the total amount of net defocus, or DV) and standard deviation of the defocus values (SDD). Information on home size, time spent outdoors, and in front of a desk were also obtained. Univariate correlation, and multivariate regression were used to assess the association between myopia progression, defocus characteristics, and other co-variates.
Results: The baseline spherical equivalent refraction (M) and refraction change over 1 year (∆M) were − 1.51 ± 2.02 D and − 0.56 ± 0.45 D respectively. DV was not significantly correlated with ∆M (Spearman’s ρ = −0.25, p = 0.08), while SDD was negatively correlated to ∆M (Spearman’s ρ = −0.42, p = 0.003). Although SDD was not a significant predictor in multivariate analysis, the regional DV at 15°–20° eccentricity was significant (p = 0.001). Home size (F2,50 = 7.01, p = 0.002) and time spent outdoors (Independent t = −2.13, p = 0.04) were also associated with ∆M, but not time spent in front of desk (Independent t = 0.78, p = 0.44).
Conclusion: The defocus profile in the home environment within the para-central field of view is associated with childhood refractive error development.
home size, living environment, myopia, near work
463-471
Choi, Kai Yip
f8755f4f-f088-4c5d-bb6d-003cfe35b68a
Mok, Angela Yuen ting
3e207e28-3b7d-4e65-8105-3b1b52e7fd64
Do, Chi wai
f95a99ca-4db2-40de-a00c-3c9438c9ae8f
Lee, Paul Hong
02620eab-ae7f-4a1c-bad1-8a50e7e48951
Chan, Henry Ho lung
573d53c4-316f-486a-a304-9389c3e8452f
1 July 2020
Choi, Kai Yip
f8755f4f-f088-4c5d-bb6d-003cfe35b68a
Mok, Angela Yuen ting
3e207e28-3b7d-4e65-8105-3b1b52e7fd64
Do, Chi wai
f95a99ca-4db2-40de-a00c-3c9438c9ae8f
Lee, Paul Hong
02620eab-ae7f-4a1c-bad1-8a50e7e48951
Chan, Henry Ho lung
573d53c4-316f-486a-a304-9389c3e8452f
Choi, Kai Yip, Mok, Angela Yuen ting, Do, Chi wai, Lee, Paul Hong and Chan, Henry Ho lung
(2020)
The diversified defocus profile of the near-work environment and myopia development.
Ophthalmic and Physiological Optics, 40 (4), .
(doi:10.1111/opo.12698).
Abstract
Purpose: To quantify the defocus characteristics in the near-work environment at home and investigate the relationship with subsequent myopia progression.
Methods: Fifty subjects (aged 7–12 years) were recruited and followed for 1 year. The home near-work environment (writing desk) was measured at a baseline home-visit using the Kinect-for-Windows to capture a 3-dimensional image. The depth values of the image were then converted into scene defocus with respect to the subject’s viewpoint. The defocus characteristics were quantified as the dioptric volume (the total amount of net defocus, or DV) and standard deviation of the defocus values (SDD). Information on home size, time spent outdoors, and in front of a desk were also obtained. Univariate correlation, and multivariate regression were used to assess the association between myopia progression, defocus characteristics, and other co-variates.
Results: The baseline spherical equivalent refraction (M) and refraction change over 1 year (∆M) were − 1.51 ± 2.02 D and − 0.56 ± 0.45 D respectively. DV was not significantly correlated with ∆M (Spearman’s ρ = −0.25, p = 0.08), while SDD was negatively correlated to ∆M (Spearman’s ρ = −0.42, p = 0.003). Although SDD was not a significant predictor in multivariate analysis, the regional DV at 15°–20° eccentricity was significant (p = 0.001). Home size (F2,50 = 7.01, p = 0.002) and time spent outdoors (Independent t = −2.13, p = 0.04) were also associated with ∆M, but not time spent in front of desk (Independent t = 0.78, p = 0.44).
Conclusion: The defocus profile in the home environment within the para-central field of view is associated with childhood refractive error development.
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More information
Accepted/In Press date: 4 May 2020
Published date: 1 July 2020
Additional Information:
Funding Information:
The authors acknowledge Dr Maureen Boost for providing advice in the preparation of the manuscript. This study was supported by General Research Fund from the Research Grants Council of the Hong Kong Special Administrative Region, China (PolyU 151001/17M) and Internal Research Grants, The Hong Kong Polytechnic University (Z0GF).
Publisher Copyright:
© 2020 The Authors. Ophthalmic and Physiological Optics published by John Wiley & Sons Ltd on behalf of College of Optometrists
Keywords:
home size, living environment, myopia, near work
Identifiers
Local EPrints ID: 474976
URI: http://eprints.soton.ac.uk/id/eprint/474976
ISSN: 0275-5408
PURE UUID: ee156fac-6ff1-4dd9-ae72-6652758e514e
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Date deposited: 08 Mar 2023 17:34
Last modified: 18 Mar 2024 04:08
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Contributors
Author:
Kai Yip Choi
Author:
Angela Yuen ting Mok
Author:
Chi wai Do
Author:
Paul Hong Lee
Author:
Henry Ho lung Chan
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