Accommodative microfluctuations (AMFs) are temporal variations in the
accommodative response. AMFs can be divided into two categories, the low
frequency component (LFC) measuring below 0.6 Hz and the high frequency
component (HFC) measuring between 1.0 and 2.3 Hz.
This thesis examined occupational factors that may affect AMFs comprising
of cognitive demand, visual fatigue and the type of digital display used.
These effects were measured by assessing changes in the LFC, mid frequency component (MFC), HFC, and RMS accommodation. Analysis of
chaos and the overall accommodative response (AR) was also used.
Furthermore, an investigation into inter- and intra-participant variability was
completed.
The HFC was shown to increase in line with increasing cognitive demand. A
significant effect for task duration was found at higher accommodative
demands for the overall AR, LFC and MFC. There was a significant effect on
the LFC and AR depending on the type of display used during near work.
The HFC and MFC were found to be less repeatable in the same participant
relative to LFC, RMS accommodation and AR measurements.
AMFs appear to have an effect on occupational factors, however more
research is required to assess how much of an effect they may have relative
to other ocular factors that affect occupational settings.
| Identifer | oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/19045 |
| Date | January 2020 |
| Creators | Hynes, Niall J. |
| Contributors | Mallen, Edward A.H., Cufflin, Matthew P. |
| Publisher | University of Bradford, School of Optometry and Vision Science, Faculty of Life Sciences |
| Source Sets | Bradford Scholars |
| Language | English |
| Detected Language | English |
| Type | Thesis, doctoral, PhD |
| Rights | <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-nc-nd/3.0/88x31.png" /></a><br />The University of Bradford theses are licenced under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/">Creative Commons Licence</a>. |
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