Reading behavior during near work in Chinese emmetropic children with different addition values

Title Reading behavior during near work in Chinese emmetropic children with different addition values
Author, Co-Author Zuopao Zhuo, Yuwen Wang, Xinjie Mao, Xianling Yang, Björn Drobe, Hao Chen
Topic
Year
2014
Day
Thursday
Program Number
145127
Room
Four Seasons Ballroom
Affiliation
WEIRC, WMU-Essilor International Research Centre, Wenzhou
Abstract PURPOSE: To evaluate changes in posture in Chinese emmetropic children while wearing spectacle lenses with different addition values during near work.

METHODS: 24 emmetropic children from Grade 4 (age 8 to 11) from the same primary school participated in this study. For every subject, posture during reading and writing tasks were measured with different addition values (plano, +1.00D, +1.50D, +2,00D, +2.50D) in random order. Between each lens, children were watching TV during 5 minutes to relax. Head and document positions in three-dimensional space were recorded continuously by means of a Polhemus Fastrak® system and confirmed using video recordings of each task. Postural parameters such as working distance, head declination and eye declination were calculated for analysis.

RESULTS: For reading (R) and writing (W) tasks with plano lenses, working distance, head and eye declinations were respectively R: 259±56 mm & W: 233±62 mm, R: 30.7±7.0 deg. & W: 39.4±13.5 deg, R: 23.2±5.3 deg. & W: 22.2±10.1 deg. Plus power additions induced significantly higher head (reading and writing, R: 34.2±1.4 deg. & W: 42.2±1.0 deg.) and lower eye declinations (reading, R: 20.4±0.8 deg. & W: 20.2±0.9 deg.) (p0.05, Fisher LSD). Positive addition power did not affect those changes (p>0.05).

CONCLUSIONS: Plus power additions modified significantly near posture in emmetropic children during reading and writing tasks, but the change was independent of the power of the addition.
Affiliation of Co-Authors The Affiliated Eye Hospital of Wenzhou Medical University, The Affiliated Eye Hospital of Wenzhou Medical University, The Affiliated Eye Hospital of Wenzhou Medical University, Essilor, WEIRC, WMU-Essilor International Research Centre, Wenzhou
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