東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Continuous Objective Assessment of n...

Williams, Rachel Christine.

FindBook

Google Book

Amazon

博客來

Continuous Objective Assessment of near Work, Light Exposure, and Activity.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Continuous Objective Assessment of near Work, Light Exposure, and Activity./
作者:	Williams, Rachel Christine.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	67 p.
附註:	Source: Masters Abstracts International, Volume: 82-07.
Contained By:	Masters Abstracts International82-07.
標題:	Ophthalmology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28182531
ISBN:	9798678149688

Continuous Objective Assessment of near Work, Light Exposure, and Activity.
Williams, Rachel Christine.

Continuous Objective Assessment of near Work, Light Exposure, and Activity. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 67 p.

Source: Masters Abstracts International, Volume: 82-07.

Thesis (M.S.)--University of Houston, 2020.

This item must not be sold to any third party vendors.

Purpose: Myopia, or nearsightedness, is an epidemic, with up to 90% of the population in urbanized countries affected. Myopia brings with it potentially blinding complications and significant socio-economic burden. Light exposure and near work are known risk factors for myopia. However, evidence regarding the role of near work in myopia is conflicting. Current technology allows for objective measurements of light exposure; however, quantification of near work is assessed via questionnaires, which are subject to poor recall, response, and parent biases. The purpose of this study was to introduce the RangeLife, a novel, custom device developed for continuous, objective measurement of near work. Further, the objective near work output was compared to traditional visual activity questionnaires and activity logs.Methods: We developed the RangeLife, a device for continuous, objective measurement of working distance. Four devices were built, calibrated, and validated. Then, adult subjects wore the device on weekdays and weekend days, while simultaneously wearing an actigraph device for objective measurements of light exposure and activity. Subjects maintained an activity log and answered a visual activity questionnaire. RangeLife data were downloaded and binned into 0.10 m intervals. Objective diopter hours (dh), a weighted measure of near work, were calculated and compared with subjective diopter hours obtained from the questionnaire.Results: Diopter hours for all subjects were significantly higher on weekdays (14.73 ± 4.67 dh) compared to weekends (11.90 ± 4.84 dh, p = 0.05). 94 ± 1.85% of near and intermediate viewing distances were recorded when the subjects were exposed to mesopic and indoor photopic light levels (<1000 lux), and 80.03 ± 2.11% during periods of sedentary physical activity (<320 counts per minute). Subjective reports of time viewing near and intermediate distances significantly overestimated objective measures (p = 0.002).Conclusions: The RangeLife was shown to provide reliable measures of viewing distance, and can be further utilized to understand potential influences of viewing behaviors on refractive error.

ISBN: 9798678149688Subjects--Topical Terms:

862704
Ophthalmology.
Subjects--Index Terms:

Myopia

Continuous Objective Assessment of near Work, Light Exposure, and Activity.
LDR:03485nmm a2200457 4500 001 2279778
005 20210823083442.5
008 220723s2020 ||||||||||||||||| ||eng d
020 $a 9798678149688
035 $a (MiAaPQ)AAI28182531
035 $a (MiAaPQ)0087vireo5398Williams
035 $a AAI28182531
040 $a MiAaPQ $c MiAaPQ
100 1 $a Williams, Rachel Christine. $3 3558253
245 1 0 $a Continuous Objective Assessment of near Work, Light Exposure, and Activity.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 67 p.
500 $a Source: Masters Abstracts International, Volume: 82-07.
500 $a Advisor: Ostrin, Lisa A.
502 $a Thesis (M.S.)--University of Houston, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a Purpose: Myopia, or nearsightedness, is an epidemic, with up to 90% of the population in urbanized countries affected. Myopia brings with it potentially blinding complications and significant socio-economic burden. Light exposure and near work are known risk factors for myopia. However, evidence regarding the role of near work in myopia is conflicting. Current technology allows for objective measurements of light exposure; however, quantification of near work is assessed via questionnaires, which are subject to poor recall, response, and parent biases. The purpose of this study was to introduce the RangeLife, a novel, custom device developed for continuous, objective measurement of near work. Further, the objective near work output was compared to traditional visual activity questionnaires and activity logs.Methods: We developed the RangeLife, a device for continuous, objective measurement of working distance. Four devices were built, calibrated, and validated. Then, adult subjects wore the device on weekdays and weekend days, while simultaneously wearing an actigraph device for objective measurements of light exposure and activity. Subjects maintained an activity log and answered a visual activity questionnaire. RangeLife data were downloaded and binned into 0.10 m intervals. Objective diopter hours (dh), a weighted measure of near work, were calculated and compared with subjective diopter hours obtained from the questionnaire.Results: Diopter hours for all subjects were significantly higher on weekdays (14.73 ± 4.67 dh) compared to weekends (11.90 ± 4.84 dh, p = 0.05). 94 ± 1.85% of near and intermediate viewing distances were recorded when the subjects were exposed to mesopic and indoor photopic light levels (<1000 lux), and 80.03 ± 2.11% during periods of sedentary physical activity (<320 counts per minute). Subjective reports of time viewing near and intermediate distances significantly overestimated objective measures (p = 0.002).Conclusions: The RangeLife was shown to provide reliable measures of viewing distance, and can be further utilized to understand potential influences of viewing behaviors on refractive error.
590 $a School code: 0087.
650 4 $a Ophthalmology. $3 862704
650 4 $a Public administration. $3 531287
650 4 $a Public health. $3 534748
650 4 $a Behavioral sciences. $3 529833
650 4 $a Information technology. $3 532993
650 4 $a Optics. $3 517925
650 4 $a Public policy. $3 532803
653 $a Myopia
653 $a Near work
653 $a Nearsightedness
653 $a Urbanized countries
653 $a Blinding complications
653 $a Actigraph device
653 $a Refractive error
690 $a 0752
690 $a 0381
690 $a 0573
690 $a 0489
690 $a 0630
690 $a 0602
690 $a 0617
710 2 $a University of Houston. $b Optometry-Vision Science. $3 3558254
773 0 $t Masters Abstracts International $g 82-07.
790 $a 0087
791 $a M.S.
792 $a 2020
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28182531