Viewing distance variation and related ophthalmological changes in office activities with and without VDUs

Détails

ID Serval
serval:BIB_BCF7FA0D5A28
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Viewing distance variation and related ophthalmological changes in office activities with and without VDUs
Périodique
Ergonomics
Auteur(s)
Piccoli  B., Braga  M., Zambelli  P. L., Bergamaschi  A.
ISSN
0014-0139 (Print)
Statut éditorial
Publié
Date de publication
05/1996
Volume
39
Numéro
5
Pages
719-28
Notes
Journal Article --- Old month value: May
Résumé
This experimental study was conducted on 14 volunteer female clerks to measure viewing distance variation and related ophthalmological changes in office activities with (session 1) and without (session 2) VDU. A video camera connected to an electronic elaborator was used to determine eye-screen distance of the VDU operators during the task. Before and after each of the two work sessions far refraction, far phorias, near point of accommodation (APP), and fusional convergence were measured. Blinking rate of each subject was measured by a transducer only during the "VDU session'. The objective measurements of the eye-screen distance, whose range was between 48.42 and 65.33 cm, allowed a precise quantification of the occupational visual load during session 1. The accommodation was about 1.5-2D on average and the fusional convergence 10-13 delta on average. The symptomatology shows a number of disturbances in session 1 (71.4%) clearly higher than in session 2 (35.7%). The study of refraction before and after the task has shown a slight excess of accommodation compared to the theoretical value in both sessions, more marked in session 1. The APP shows no statistical significative variation. A tendency to exophoria was registered at the beginning and at the end of the trial and the fusional convergence clearly decreased, especially in the first session.
Mots-clé
Accommodation, Ocular/*physiology Adult Asthenopia/diagnosis/*physiopathology Attention/physiology Blinking/physiology *Computer Terminals Convergence, Ocular/*physiology Exotropia/diagnosis/physiopathology Female Humans Occupational Diseases/diagnosis/*physiopathology Reference Values Refraction, Ocular
Pubmed
Web of science
Création de la notice
28/01/2008 13:29
Dernière modification de la notice
03/03/2018 20:57
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