Axial elongation following prolonged near work in myopes and emmetropes
Woodman, Emily, Read, Scott A., Collins, Michael J., Hegarty, Katherine, Priddle, Scott, Smith, Josephine, & Perro, Judd (2011) Axial elongation following prolonged near work in myopes and emmetropes. British Journal of Ophthalmology, 95, pp. 652-656.
Background/aims: To investigate the influence of a period of sustained near work upon axial length in groups of emmetropes and myopes.
Methods: Forty young adult subjects (20 myopes and 20 emmetropes) were recruited for the study. Myopes were further classified as either early onset (EOM), late onset (LOM), stable (SM) or progressing (PM) subgroups. Axial length was measured with the IOLMaster instrument before, immediately after and then again 10 minutes after a continuous 30 minute near task of 5 D accommodation demand. Measures of distance objective refraction were also collected.
Results: Significant changes in axial length were observed immediately following the near task. EOM axial length elongated on average by 0.027 ± 0.021 mm, LOM by 0.014 ± 0.020 mm, EMM by 0.010 ± 0.015 mm, PM by 0.031 ± 0.022 mm, and SM by 0.014 ± 0.018 mm. At the conclusion of the 10 minute regression period, axial length measures were not significantly different from baseline values.
Conclusion: Axial elongation was observed following a prolonged near task. Both EOM and PM groups showed increases in axial length that were significantly greater than emmetropes
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|Item Type:||Journal Article|
|Keywords:||Myopia, Accommodation, Near Work, Axial Elongation|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
|Copyright Owner:||Copyright 2010 the authors. Produced by BMJ Publishing Group Ltd under licence|
|Deposited On:||08 Nov 2010 13:53|
|Last Modified:||25 Jan 2013 03:32|
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