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Is there a difference between the Magnitude and the Decay Time of NITM in Different Refractive Groups.
Linnaeus University, Faculty of Health and Life Sciences, Department of Medicine and Optometry.
2013 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Myopia is a worldwide renowned public health problem. There are myopic after effects known to occur after a neartask. One of those is Transient myopia. Purpose: The purpose of this study was to determine if there was any difference in the magnitude and the duration of the myopic after effect (NITM) between LOM, EOM and EMM when NITM was clinically induced. Methods: Young-adults (n = 30) divided into an emmetropic (EMM) group (n = 10), a Late Onset Myopia (LOM) group (n = 8), and an Early Onset Myopia (EOM) group (n = 12) performed a reading task at 20 cm to clinically induce NITM. Distance refraction errors were measured objectively with an autorefractor ( Nikon speedy - K) to calculate the magnitude of the initial NITM. The decay time was calculated as the time when the posttask distance refraction had gone back to the pretask baseline. Result: The initial NITM was higher in the EOM with a mean value of 0.28D compared to the LOM (0.11D) and EMM (0.14D) but with no statistical significant difference. The two myopic groups were combined into one myopic group with a mean initial NITM of 0.21D but there were no significant difference between EMM and Myopes. The decay time of the EOM was slightly higher with an average time of 35 s but there were no significant difference compared to the EMM group, which had an average time of 22 s. Neither was there any significant difference when the EMM and LOM were compared, the LOM had an average time of 16 s. Neither could any significant difference be found when the two myopic groups were combined into one group with an average decay time of 27 s. Conclusion: There was no significant difference in the NITM between EMM and Myopes. There was also no significant difference in the decay time between EMM and Myopes. EOM had slightly higher magnitude of NITM and longer decay time than EMM and LOM but it was not significant.

Place, publisher, year, edition, pages
2013. , p. 26
Keywords [en]
NITM, Nearwork Induced Transient Myopia
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:lnu:diva-30119OAI: oai:DiVA.org:lnu-30119DiVA, id: diva2:661603
Subject / course
Optometry
Educational program
Optometry Programme, 180 credits
Presentation
(Swedish)
Supervisors
Examiners
Available from: 2013-11-06 Created: 2013-11-04 Last updated: 2013-11-06Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
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  • vancouver
  • Other style
More styles
Language
  • de-DE
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  • en-US
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  • nn-NB
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  • Other locale
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Output format
  • html
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  • asciidoc
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