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dc.contributor.advisorBaraas, Rigmor C.
dc.contributor.authorKjærland, Marianne
dc.date.accessioned2021-11-19T17:41:22Z
dc.date.issued2021
dc.identifierno.usn:wiseflow:2513881:40858804
dc.identifier.urihttps://hdl.handle.net/11250/2830544
dc.descriptionFull text not available
dc.description.abstractPurpose: The purpose of this study was to investigate the relationship between eye growth and choroidal thickness changes from winter to summer among schoolchildren part of the Southeast Norway Vision and Visuomotor (SNOW) study in Norway. Method: This study was a 5-month prospective cohort study in Kongsberg, Norway, and it was part of the larger, longitudinal SNOW study. Eighty-three healthy, Norwegian children in the 2nd and 5th grade in primary school were recruited with a grouping of 39 7–8-year-olds (48% female), and 44 10–11-year-olds (50% female). Measurements of non-cycloplegic autorefraction, axial length, corneal radius and choroid thickness were obtained in the data collections in January and June. Cycloplegic measurements from 69 participants were obtained from measurements a week after the primary data collection in January. Measurements of the right eye were included for the study. Results: The ocular axial length and subfoveal choroidal thickness showed a significant relationship, with no strong differences in correlation between seasons. The correlations were stronger in the 5th grade compared to the 2nd grade for both seasons (cor: -0.47, t=-4.98, p=0.000 vs. cor: -0.33, t=-3.07, p=0.002). Looking at the whole population, there was a significant difference in ocular biometry and subfoveal choroid thickness between the sexes and grades, where the boys had a significant longer mean axial length (t=-5.3, p=0.000), and a significantly thinner subfoveal choroid thickness (t=2.01, p=0.04) compared to the girls. There were not found significantly differences in the axial length between the grades (t= -1.04, p=0.29), but there was a significant difference in subfoveal choroid thickness, where 10—11-year-olds had significantly thicker choroids compared to 7—8-year-olds (t=2.87, p=0.004). No strong tendency of participants with thin subfoveal choroids having more eye growth than children with thicker subfoveal choroids was found. The strongest factor for eye growth was the age of the participants, where the participants in the 2nd grade had significantly more eye growth compared to those in the 5th grade (t=5.2, p=0.000). Conclusion: The present results confirmed that there was a significant relationship between ocular axial length and subfoveal choroid thickness. There was a significant difference in ocular biometry between the sexes when looking at the whole population, where boys had longer axial length and thinner subfoveal choroid thickness. The choroid was thinner in the 7–8-year-olds, showing that there was an ongoing thickening process during childhood. A significant relationship between having a thin or thick subfoveal choroid thickness and more eye growth was not found, and neither was there a clear tendency of a stronger correlation between axial length and subfoveal choroid thickness in either January or June. The largest factor for eye growth was the age of the participants, where the younger participants exhibited significant more eye growth from January to June. A larger sample and a longer time perspective are warranted to look at seasonal variation and choroid thickness changes in Norwegian schoolchildren. Key words: eye growth, ametropia, ocular biometry, subfoveal choroid thickness, seasonal variation
dc.description.abstract
dc.languageeng
dc.publisherUniversity of South-Eastern Norway
dc.titleEye growth between January and June in primary school children in Norway: assessing changes in ocular biometry and choroidal thickness
dc.typeMaster thesis


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