The diversified defocus profile of the near-work environment and myopia development.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
Kai Yip ChoiHenry Ho-Lung Chan

Abstract

To quantify the defocus characteristics in the near-work environment at home and investigate the relationship with subsequent myopia progression. 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. 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 multivaria...Continue Reading

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Citations

Sep 21, 2021·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Khob R Bhandari, Lisa A Ostrin
Oct 7, 2021·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Kai Yip ChoiHenry Ho-Lung Chan
Nov 20, 2021·Investigative Ophthalmology & Visual Science·Kai Yip Choi, Henry Ho-Lung Chan

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Software Mentioned

MATLAB
Kinect for Windows
Flitcroft
SPSS
Kinect

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