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Title: | A novel instrument for logging nearwork distance | Authors: | Leung, TW Flitcroft, DI Wallman, J Lee, TH Zheng, Y Lam, CSY Kee, CS |
Issue Date: | Mar-2011 | Source: | Ophthalmic and physiological optics, Mar. 2011, v. 31, no. 2, p. 137-144 | Abstract: | Purpose: To validate a novel ultrasonic sensor for logging reading distances. In addition, this device was used to compare the habitual reading distances between low and high myopes. Methods: First, the stability and sensitivity of the ultrasonic device were determined by repeated measures using artificial targets. Then, thirty Hong Kong Chinese (20-30years) were recruited, of whom fifteen were considered to be high myopes (mean±S.D.=-8.7±0.5D) and 15 to be low to non-myopes (mean±S.D.=-2.0±0.2D). Each subject read a newspaper with their habitual visual aid continuously for 10min in two sessions at their preferred working distance(s). The reading distances were recorded continuously using a novel nearwork analyzer. The modal working distance was considered as the 'habitual' reading distance. In addition, habitual reading distance was reported orally by each subject. Results: The nearwork analyzer gave accurate and repeatable measurements over a range of distances and angles. Using this instrument, high myopes were found to have a significantly shorter reading distance than low myopes or non-myopes (mean±S.D.=35.9±9.8cm vs 50.9±24.8cm; two-sample t-test, p=0.04, df=18). The reading distances reported orally by the subjects were not correlated with those recorded by the nearwork analyzer. Conclusions: The nearwork analyzer was found to be an effective tool for measuring nearwork reading distance in a small group of emmetropic and myopic adults over a 10min interval. Differences between the reading distance between high myopes and low/non-myopes was detected by the device. Further study is needed to determine if a closer working distance is a cause or effect of myopia development. | Keywords: | Instrument Myopia Near working distance Reading habits Refractive error |
Publisher: | Wiley-Blackwell | Journal: | Ophthalmic and physiological optics | ISSN: | 0275-5408 | EISSN: | 1475-1313 | DOI: | 10.1111/j.1475-1313.2010.00814.x | Rights: | © 2011 The College of Optometrists This is the peer reviewed version of the following article: Leung, T.-w., Flitcroft, D.I., Wallman, J., Lee, T.H., Zheng, Y., Lam, C.S.-y. and Kee, C.-s. (2011), A novel instrument for logging nearwork distance. Ophthalmic and Physiological Optics, 31: 137-144., which has been published in final form at https://doi.org/10.1111/j.1475-1313.2010.00814.x. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. |
Appears in Collections: | Journal/Magazine Article |
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File | Description | Size | Format | |
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1826_Leung 2011._Nearwork Analyzer.pdf | Pre-Published version | 2.83 MB | Adobe PDF | View/Open |
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