Related Experiment Video
Updated: Feb 9, 2026

Determining Soil-transmitted Helminth Infection Status and Physical Fitness of School-aged Children
Published on: August 22, 2012
Internal Astigmatism and Its Role in the Growth of Axial Length in School-Age Children
Liangcheng Wu1, Chenghai Weng1, Fei Xia1
1Department of Ophthalmology, Jing'an District Centre Hospital of Shanghai, Fudan University, Shanghai, China.
Objectives:
To explore the role of internal astigmatism (IA) in the growth of axial length (AL) in school-age children.
Methods:
Total astigmatism (TA), corneal astigmatism (CA), and AL of all children in Jing'an District 2nd Centre Primary School in Shanghai were measured. In IA, the difference between TA and CA was also calculated using vector analysis. The association of axial length with IA, genders, and age was analyzed using linear regression. The difference of IA between both eyes was also calculated. The AL between both eyes was compared using paired samples t-test when DIA = 0 D, <0.5 D, and ≥0.5 D.
Results:
Six hundred and twelve cases (98.23%) in 623 children aged 7-12 yrs older entered into the study. Genders, age, and IA all affected AL. This could be represented by a linear regression line in the form AL = 21.46 - 0.43∗gender + 0.22∗age + 0.46∗IA (male = 1, female = 2; t = 7.01, P < 0.01 for sex; t = 11.6, P < 0.01 for age; and t = 6.6, P < 0.01 for IA; R2 = 0.16). The AL in the eye with larger IA was also longer when DIA was larger than 0.5 D (t = 2.65, P < 0.01).
Conclusions:
IA was observed to be associated with AL and might be a risk factor of the onset and progress of myopia in school-age children.
More Related Videos
08:05Measuring Statistical Learning Across Modalities and Domains in School-Aged Children Via an Online Platform and Neuroimaging Techniques
Published on: June 30, 2020
14:15Measurement Of Neuromagnetic Brain Function In Pre-school Children With Custom Sized MEG
Published on: February 19, 2010
Related Concept Videos
Role of Hematopoietic Growth Factors
Thrombopoietin (TPO), mainly released by the liver,...
Internal Energy
Axial and Appendicular Muscles
Axial Muscles
Axial muscles, situated along the body's midline, are intricately connected to the axial skeleton, which includes the skull, spine, ribs, and sternum. These muscles facilitate facial expressions and...
Internal Receptors
Overview of the Axial Skeleton
The axial skeleton of the...
General Case of Eccentric Axial Loading
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...