Post-Nearwork Myopic Shift between NonPresbyopia and Presbyopia / Nurul Naquiah Sulaiman

The purpose of the current study was to determine and compare the post-nearwork myopic shift between non-presbyopia and presbyopia. Post-nearwork myopic shift refers to the small, transient, pseudomyopic shift in the far point of the eye after a period of sustained near work. Post-nearwork myopic s...

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Main Author:	Sulaiman, Nurul Naquiah
Format:	Thesis
Language:	English
Published:	2015
Subjects:	Refraction and errors of refraction and accommodation
Online Access:	https://ir.uitm.edu.my/id/eprint/22403/1/TD_NURUL%20NAQUIAH%20SULAIMAN%20HS%20B%2015_5.pdf
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id	my-uitm-ir.22403
record_format	uketd_dc
spelling	my-uitm-ir.224032018-12-10T01:28:41Z Post-Nearwork Myopic Shift between NonPresbyopia and Presbyopia / Nurul Naquiah Sulaiman 2015 Sulaiman, Nurul Naquiah Refraction and errors of refraction and accommodation Optometry. Opticians. Eyeglasses The purpose of the current study was to determine and compare the post-nearwork myopic shift between non-presbyopia and presbyopia. Post-nearwork myopic shift refers to the small, transient, pseudomyopic shift in the far point of the eye after a period of sustained near work. Post-nearwork myopic shift was also defined as shortterm myopic far point shift immediately following a sustained near visual task. The previous studies had been done regarding the comparison between post-nearwork myopic shift in refractive errors and visual discomfort but less was done among early and late presbyopia population (>35 year old). This was a study in determining the initial magnitude of post-nearwork myopic shift between non-presbyopia and presbyopia and to assess the different of initial magnitude of post-nearwork myopic shift between these two groups. This research was conducted in UiTM Puncak Alam, Selangor involving 14 non-presbyopes with no addition power and 9 presbyopes whom at least need +1.00 DS in either eye for near vision in addition to their best corrected distance correction. To allow for dissipation of any residual accommodative transients, subjects remained seated in total darkness for 5 min. After dark adaptation, subjects viewed binocularly at distant target (6 m) for 2 min and immediately focus at near task which was done using the spot-the-difference target for about 5 min with additional lens (if needed). The distant target (6 m) was introduced after the near viewing for about 2 min upon removal of addition lens (if any). Post-nearwork myopic shift was calculated as the difference in five measurements of post-near task distance refractive state compared with the five measurements of pre-near task distance refractive state. The post-nearwork myopic shift initial (mean ± SD) analysed by the Mann-Whitney U test was -0.67 ± 0.61 DS (mean rank = 16.72) for non-presbyopes and -0.15 ± 0.09 DS (mean rank = 8.96) for presbyopes by statistically significantly difference of p = 0.005. At the end of this study, it can be concluded that there was initial magnitude of post-nearwork myopic shift present in all individuals and it was higher in non-presbyope group compared to the presbyope group. 2015 Thesis https://ir.uitm.edu.my/id/eprint/22403/ https://ir.uitm.edu.my/id/eprint/22403/1/TD_NURUL%20NAQUIAH%20SULAIMAN%20HS%20B%2015_5.pdf text en public degree Universiti Teknologi MARA, Selangor, Puncak Alam Campus Faculty of Health Science
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Refraction and errors of refraction and accommodation Refraction and errors of refraction and accommodation
spellingShingle	Refraction and errors of refraction and accommodation Refraction and errors of refraction and accommodation Sulaiman, Nurul Naquiah Post-Nearwork Myopic Shift between NonPresbyopia and Presbyopia / Nurul Naquiah Sulaiman
description	The purpose of the current study was to determine and compare the post-nearwork myopic shift between non-presbyopia and presbyopia. Post-nearwork myopic shift refers to the small, transient, pseudomyopic shift in the far point of the eye after a period of sustained near work. Post-nearwork myopic shift was also defined as shortterm myopic far point shift immediately following a sustained near visual task. The previous studies had been done regarding the comparison between post-nearwork myopic shift in refractive errors and visual discomfort but less was done among early and late presbyopia population (>35 year old). This was a study in determining the initial magnitude of post-nearwork myopic shift between non-presbyopia and presbyopia and to assess the different of initial magnitude of post-nearwork myopic shift between these two groups. This research was conducted in UiTM Puncak Alam, Selangor involving 14 non-presbyopes with no addition power and 9 presbyopes whom at least need +1.00 DS in either eye for near vision in addition to their best corrected distance correction. To allow for dissipation of any residual accommodative transients, subjects remained seated in total darkness for 5 min. After dark adaptation, subjects viewed binocularly at distant target (6 m) for 2 min and immediately focus at near task which was done using the spot-the-difference target for about 5 min with additional lens (if needed). The distant target (6 m) was introduced after the near viewing for about 2 min upon removal of addition lens (if any). Post-nearwork myopic shift was calculated as the difference in five measurements of post-near task distance refractive state compared with the five measurements of pre-near task distance refractive state. The post-nearwork myopic shift initial (mean ± SD) analysed by the Mann-Whitney U test was -0.67 ± 0.61 DS (mean rank = 16.72) for non-presbyopes and -0.15 ± 0.09 DS (mean rank = 8.96) for presbyopes by statistically significantly difference of p = 0.005. At the end of this study, it can be concluded that there was initial magnitude of post-nearwork myopic shift present in all individuals and it was higher in non-presbyope group compared to the presbyope group.
format	Thesis
qualification_level	Bachelor degree
author	Sulaiman, Nurul Naquiah
author_facet	Sulaiman, Nurul Naquiah
author_sort	Sulaiman, Nurul Naquiah
title	Post-Nearwork Myopic Shift between NonPresbyopia and Presbyopia / Nurul Naquiah Sulaiman
title_short	Post-Nearwork Myopic Shift between NonPresbyopia and Presbyopia / Nurul Naquiah Sulaiman
title_full	Post-Nearwork Myopic Shift between NonPresbyopia and Presbyopia / Nurul Naquiah Sulaiman
title_fullStr	Post-Nearwork Myopic Shift between NonPresbyopia and Presbyopia / Nurul Naquiah Sulaiman
title_full_unstemmed	Post-Nearwork Myopic Shift between NonPresbyopia and Presbyopia / Nurul Naquiah Sulaiman
title_sort	post-nearwork myopic shift between nonpresbyopia and presbyopia / nurul naquiah sulaiman
granting_institution	Universiti Teknologi MARA, Selangor, Puncak Alam Campus
granting_department	Faculty of Health Science
publishDate	2015
url	https://ir.uitm.edu.my/id/eprint/22403/1/TD_NURUL%20NAQUIAH%20SULAIMAN%20HS%20B%2015_5.pdf
_version_	1783733814022897664

Post-Nearwork Myopic Shift between NonPresbyopia and Presbyopia / Nurul Naquiah Sulaiman

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