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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+One
2016 ; 11
(5
): e0154671
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Near Work Related Behaviors Associated with Myopic Shifts among Primary School
Students in the Jiading District of Shanghai: A School-Based One-Year Cohort
Study
#MMPMID27139017
You X
; Wang L
; Tan H
; He X
; Qu X
; Shi H
; Zhu J
; Zou H
PLoS One
2016[]; 11
(5
): e0154671
PMID27139017
show ga
PURPOSE: To investigate the characteristics of various near work related
behaviors among primary students and their associations with changes in myopia
related ocular biometric parameters during one-year of follow up. METHODS: A
school-based sample of 4,814 primary 1st to 4th grade students aged 6-10 years
old were selected by cluster randomization based on probability proportion to
size in 2013. At baseline, students together with their parents filled in a
self-administered questionnaire on 9 aspects of near work related behaviors and
some important covariants of myopia. A comprehensive set of eye examinations
including axial length (AL) and cycloplegic refraction was conducted both at
baseline and one year later. RESULTS: With the grade level increase, students did
increasingly better at finding various ways to have an eye break, but they were
increasingly likely to continuously do long-time near work without an eye break.
Keeping a reasonable eye distance and correct hand posture for reading, writing,
or watching TV became worse for the first time before grade 2, but then became
better at grade 3. In contrast, selecting appropriate lighting environments or
situations and keeping a balanced diet became better for the first time before
grade 2, but then became worse at grade 3. At one-year follow up, the mean AL
increased by 0.32 ± 0.35 mm, the ratio of AL divided by the mean corneal radius
of curvature (AL/CR ratio) increased by 0.032 ± 0.054, the myopic spherical
equivalent (SE) increased by -0.51 ± 0.51 diopters and the incidence of myopia
was 16.0% (237/1,477). After controlling for the confounding effects of parental
myopia, student's age, gender, height, daily near work time, daily outdoor
activity time and all of the other near work related behaviors, keeping a
reasonable distance when reading, writing and watching TV was associated with
elongation of the AL [standard coefficient beta = -0.062, P = 0.004], a change in
SE [beta = -0.072, P = 0.020] and incident myopia [adjusted odds ratio (aOR) =
0.90, 95% confidence interval (CI): 0.84-0.96]. Selecting an environment with
adequate light for visual comfort to read and write was related to elongation of
the AL [beta = -0.039, P = 0.034] and increase of AL/CR ratio [beta = -0.030, P =
0.048]. Also, not continuing to do near work for more than 30-40 minutes without
an eye break was related to increase of the AL/CR ratio [beta = -0.028, P =
0.044] and a change in SE [beta = -0.064, P = 0.023]. CONCLUSION: Various near
work related behaviors changed according to grade level in primary school
students. Independent of hereditary factors, daily near work load and outdoor
activity, near work related behaviors such as keeping an inappropriate eye
distance for near work, selecting inadequate lighting environments, and
continuing to do near work without an eye break were risk factors for myopic
shifts.