Please use this identifier to cite or link to this item: https://doi.org/10.1097/00006324-199906000-00014
Title: Distance, lighting, and parental beliefs: Understanding near work in epidemiologic studies of myopia
Authors: Saw, S.-M. 
Nieto, F.J.
Katz, J.
Chew, S.-J.
Keywords: Near work
Questionnaire
Reliability
Short-sightedness
Validity
Issue Date: Jun-1999
Citation: Saw, S.-M.,Nieto, F.J.,Katz, J.,Chew, S.-J. (1999-06). Distance, lighting, and parental beliefs: Understanding near work in epidemiologic studies of myopia. Optometry and Vision Science 76 (6) : 355-362. ScholarBank@NUS Repository. https://doi.org/10.1097/00006324-199906000-00014
Abstract: Purpose. To develop measures and indices of factors (distance of eye from object, posture, and lighting) that may modify a possible effect of near work activity on myopia. Methods. The duration of near work, the distance of an object from eye, lighting conditions, and other sociodemographic characteristics were asked in an interview. Both distance and lighting information from the questionnaire were compared with more precise measurements. Results. Diopter hours were quantified as the duration of near work multiplied by the reciprocal of the distance which the activity was performed. The intraclass correlation coefficient of the reliability of distance information for each type of near work activity ranged from 0.43 to 0.91. Home light meter readings were significantly higher for children who were reading under both room and reading light, and the distances from the questionnaire were comparable to the measured distances. Conclusions. Measures of posture, distance, and lighting factors have been developed to study the possible effect modifiers of the effects of near work on myopia.
Source Title: Optometry and Vision Science
URI: http://scholarbank.nus.edu.sg/handle/10635/113443
ISSN: 10405488
DOI: 10.1097/00006324-199906000-00014
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