Four-year change in ocular biometric components and refraction in schoolchildren: A cohort study
Purpose: To determine 4-year changes of ocular biometric and dioptric components in Iranian children aged 7–11 years following the first phase. Methods: 468 children were evaluated in the first phase of the study in 2012 and again in 2016–2017. Multi-stage stratified cluster sampling was applied to...
Main Authors: | , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Wolters Kluwer Medknow Publications
2019-06-01
|
Series: | Journal of Current Ophthalmology |
Online Access: | http://www.sciencedirect.com/science/article/pii/S2452232518302312 |
id |
doaj-50b31983ddb740458fe71518e299783c |
---|---|
record_format |
Article |
spelling |
doaj-50b31983ddb740458fe71518e299783c2021-03-02T04:47:19ZengWolters Kluwer Medknow PublicationsJournal of Current Ophthalmology2452-23252019-06-01312206213Four-year change in ocular biometric components and refraction in schoolchildren: A cohort studyHamed Momeni-Moghaddam0Hassan Hashemi1Siamak Zarei-Ghanavati2Hadi Ostadimoghaddam3Abbasali Yekta4Mehdi Khabazkhoob5Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, IranNoor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, IranEye Research Center, Mashhad University of Medical Sciences, Mashhad, IranEye Research Center, Mashhad University of Medical Sciences, Mashhad, IranRefractive Errors Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Corresponding author.Department of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, IranPurpose: To determine 4-year changes of ocular biometric and dioptric components in Iranian children aged 7–11 years following the first phase. Methods: 468 children were evaluated in the first phase of the study in 2012 and again in 2016–2017. Multi-stage stratified cluster sampling was applied to select the participants. The Topcon autorefractometer and the LENSTAR/BioGraph biometer (WaveLight AG, Erlangen, Germany) were used for cycloplegic refraction and biometry, respectively. All measurements were repeated at 4 years as the baseline assessments. Results: Of 468 children, 251 (53.6%) were boys. Spherical equivalent (SE) showed a marked myopic shift (P = 0.000) in the second phase which was significantly higher in boys (0.24 vs. 0.18 D) (P < 0.001). Axial length (AL) and anterior chamber depth (ACD) increased by 0.49 ± 0.05 and 0.12 ± 0.02 mm, while lens thickness (LT) and lens power (LP) decreased by 0.08 ± 0.01 mm and 1.59 ± 0.12 D, respectively (P < 0.05). The mean corneal curvature and thickness did not change significantly during 4 years. All biometric component changes were greater in boys. Biometric changes in different age groups showed a decreased LP, increased AL, and increased ACD in most age groups (P < 0.05), while LT and SE did not change significantly in the age groups 9 and 11 years and 8 and 9 years, respectively. Changes in the corneal thickness, diameter, curvature, and refractive astigmatism were not significant in any of the age groups (P > 0.05). Conclusions: Statistical and clinical changes were seen in AL, ACD, LP, and LT. The changes observed in biometric components (AL, ACD, and LT) had a sinus rhythm. Keywords: Ocular dioptric component, Children, Biometry, Axial length, Lens power, Keratometry, Age, Sexhttp://www.sciencedirect.com/science/article/pii/S2452232518302312 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hamed Momeni-Moghaddam Hassan Hashemi Siamak Zarei-Ghanavati Hadi Ostadimoghaddam Abbasali Yekta Mehdi Khabazkhoob |
spellingShingle |
Hamed Momeni-Moghaddam Hassan Hashemi Siamak Zarei-Ghanavati Hadi Ostadimoghaddam Abbasali Yekta Mehdi Khabazkhoob Four-year change in ocular biometric components and refraction in schoolchildren: A cohort study Journal of Current Ophthalmology |
author_facet |
Hamed Momeni-Moghaddam Hassan Hashemi Siamak Zarei-Ghanavati Hadi Ostadimoghaddam Abbasali Yekta Mehdi Khabazkhoob |
author_sort |
Hamed Momeni-Moghaddam |
title |
Four-year change in ocular biometric components and refraction in schoolchildren: A cohort study |
title_short |
Four-year change in ocular biometric components and refraction in schoolchildren: A cohort study |
title_full |
Four-year change in ocular biometric components and refraction in schoolchildren: A cohort study |
title_fullStr |
Four-year change in ocular biometric components and refraction in schoolchildren: A cohort study |
title_full_unstemmed |
Four-year change in ocular biometric components and refraction in schoolchildren: A cohort study |
title_sort |
four-year change in ocular biometric components and refraction in schoolchildren: a cohort study |
publisher |
Wolters Kluwer Medknow Publications |
series |
Journal of Current Ophthalmology |
issn |
2452-2325 |
publishDate |
2019-06-01 |
description |
Purpose: To determine 4-year changes of ocular biometric and dioptric components in Iranian children aged 7–11 years following the first phase. Methods: 468 children were evaluated in the first phase of the study in 2012 and again in 2016–2017. Multi-stage stratified cluster sampling was applied to select the participants. The Topcon autorefractometer and the LENSTAR/BioGraph biometer (WaveLight AG, Erlangen, Germany) were used for cycloplegic refraction and biometry, respectively. All measurements were repeated at 4 years as the baseline assessments. Results: Of 468 children, 251 (53.6%) were boys. Spherical equivalent (SE) showed a marked myopic shift (P = 0.000) in the second phase which was significantly higher in boys (0.24 vs. 0.18 D) (P < 0.001). Axial length (AL) and anterior chamber depth (ACD) increased by 0.49 ± 0.05 and 0.12 ± 0.02 mm, while lens thickness (LT) and lens power (LP) decreased by 0.08 ± 0.01 mm and 1.59 ± 0.12 D, respectively (P < 0.05). The mean corneal curvature and thickness did not change significantly during 4 years. All biometric component changes were greater in boys. Biometric changes in different age groups showed a decreased LP, increased AL, and increased ACD in most age groups (P < 0.05), while LT and SE did not change significantly in the age groups 9 and 11 years and 8 and 9 years, respectively. Changes in the corneal thickness, diameter, curvature, and refractive astigmatism were not significant in any of the age groups (P > 0.05). Conclusions: Statistical and clinical changes were seen in AL, ACD, LP, and LT. The changes observed in biometric components (AL, ACD, and LT) had a sinus rhythm. Keywords: Ocular dioptric component, Children, Biometry, Axial length, Lens power, Keratometry, Age, Sex |
url |
http://www.sciencedirect.com/science/article/pii/S2452232518302312 |
work_keys_str_mv |
AT hamedmomenimoghaddam fouryearchangeinocularbiometriccomponentsandrefractioninschoolchildrenacohortstudy AT hassanhashemi fouryearchangeinocularbiometriccomponentsandrefractioninschoolchildrenacohortstudy AT siamakzareighanavati fouryearchangeinocularbiometriccomponentsandrefractioninschoolchildrenacohortstudy AT hadiostadimoghaddam fouryearchangeinocularbiometriccomponentsandrefractioninschoolchildrenacohortstudy AT abbasaliyekta fouryearchangeinocularbiometriccomponentsandrefractioninschoolchildrenacohortstudy AT mehdikhabazkhoob fouryearchangeinocularbiometriccomponentsandrefractioninschoolchildrenacohortstudy |
_version_ |
1724242911667683328 |