Luminance of the Surround and Visual Fatigue of VDT Operators

• Autorzy: Wolska A. , Swituta M.
• Języki publikacji: EN

Abstrakty

EN

Luminance distribution in the visual field is considered as one of causal factors with a significant influence on visual fatigue, especially for intensive and extended Video Display Terminal (VDT) work. The aim of the study was to define visual fatigue of VDT operators for different values of surrounding luminance. Experiments were carried out in laboratory conditions under 3 lighting conditions. Only 1 lighting parameter - the luminance of the wall behind the display (surrounding luminance) - changed. Visual fatigue was measured both by a subjective evaluation of different visual complaints (asthenopic symptoms) and by objective measurements of changes in the following visual functions: accommodation, convergence, habitual horizontal phoria, critical fusional frequency (CFF), and visual acuity. The same experiments were done for CRT (Cathode Ray Tube) and LCD TFT (Liquid Crystal Display with Thin Film Transistor) screens. The results of the study have shown that there was no significant influence of the value of surrounding luminance on the asthenopic symptoms for either type of screen. A general tendency towards bigger visual complaints for LCD TFT than for CRT participants was found. An objective evaluation of visual fatigue demonstrated a tendency towards bigger changes in visual functions with an increase of surrounding luminance for both screens. Statistical analysis of the results has shown that surrounding luminance influences significantly the reduction of the accommodation amplitude (significance level < .05).

Słowa kluczowe

EN

luminance; visual fatigue; CRT screen

PL

luminancja; zmęczenie wzroku; oświetlenie

• Wydawca: Taylor & Francis
• Czasopismo: International Journal of Occupational Safety and Ergonomics
• Rocznik: 1999
• Tom: Vol. 5, No. 4
• Strony: 553--580
• Opis fizyczny: Bibliogr. 39 poz., tab., wykr.

Twórcy

autor

Wolska A.

• Central Institute for Labour Protection, Poland

autor

Swituta M.

• Warsaw Medical Academy, Poland

Bibliografia

• [1] Assini, R., D’Orso, M., Pierini, F., Franceschin, S., Pastoni, F., & Piccoli, B. (1997). Microbiological aspects of work with display units. In H. Miyamoto, S. Saito, M. Kajiyama, & N. Koizumi (Eds.), Proceedings of Work with Display Units WWDU '97, Tokyo (pp. 85-86). Tokorozawa, Japan: Waseda University.
• [2] Bennett, A.G., & Rabbetts, R.B. (1989). Clinical visual optics (2nd ed.). London, UK: Butterworths.
• [3] Bergqvist, U.O.V. (1984). VDTs and health: A technical and medical appraisal of the state of art. Scandinavian Journal of Work, Environment and Health, 10 (Suppl. 2), 1-87.
• [4] Dainoff, M, Baliett, J., Blatman, H., Cohen, B.G.F., & Hecht-Dainoff, M. (1994). Musculoskeletal, postural, visual, and psychosocial outcomes resulting from ergonomic and optometric intervention: The U.S. component of the international MEPS study. In A. Grieco, G. Molteni, E. Occhipinti, & B. Piccoli (Eds.), Proceedings of Work with Display Units WWDU ’94, Milan (Vol. 2, pp. C1-C2). Milan, Italy: Univesity of Milan.
• [5] D’Orso, M., Zambelli, P., Pierini, F., Assini, R., & Piccoli, B. (1997). Electronic evaluation of visual work load in VDT/PC operators. In H. Miyamoto, S. Saito, M. Kajiyama, & N. Koizumi (Eds.), Proceedings of Work with Display Units WWDU ’97, Tokyo (pp. 121-122). Tokorozawa, Japan: Waseda University.
• [6] European Committee for Standardization (CEN). (1996). Lighting applications-Lighting of work places (Standard No. prEN 12464:1996). Brussels, Belgium: Author.
• [7] Gunnarson, E., & Ostberg, O. (1977). National Board of Occupational Safety and Health Reports 35: The physical and psychological working environment in a terminal-based computer storage and retrieval system. Stockholm, Sweden: National Board of Occupational Safety and Health.
• [8] Gunnarson, E., & Soderberg, I. (1983). Eye strain resulting from VDT work at the Swedish telecommunications administration. Applied Ergonomics, 14, 61-69.
• [9] Hedman L.R., & Briem V. (1984). Short-term changes in eyestrain of VDU users as a function of age. Human Factors, 26(3), 357-370.
• [10] Horgen, G. (1992). The international cooperative study of musculoskeletal discomfort, eye strain and psychosocial stress among VDU workers. Methods of optometric part of the study. In H. Luczak, A.E. Çakir, & G. Çakir (Eds.), Proceedings of Work with Display Units WWDU ’92, Berlin (pp. D11-D12). Berlin, Germany: Technische Universität Berlin.
• [11] Horgen, G., & Aarås, A. (1994). The optometric corrections, the eyes discomfort, the postural load and the development of pain in the musculoskeletal system among the VDT operators. An intervention study. In A. Grieco, G. Molteni, E. Occhipinti, & B. Piccoli (Eds.), Proceedings of Work with Display Units WWDU '94, Milan (Vol. 2, pp. C4-C6). Milan, Italy: Univesity of Milan.
• [12] International Commission on Illumination (CIE). (1983). Discomfort glare in the interior working environment (Publication CIE No. 55:1983). Paris, France: Author.
• [13] International Commission on Illumination (CIE). (1984). Vision and the visual display unit work station (Publication CIE No. 60:1984). Paris, France: Author.
• [14] International Organization for Standardization (ISO). (1992). Ergonomic requirements for office work with visual display terminals (VDTs)-Part 3: Visual display requirements (Standard No. ISO 9241-3:1992). Geneva, Switzerland: Author.
• [15] International Organization for Standardization (ISO). (1993). Ergonomic requirements for work with visual display terminals-Part 3: Visual display requirements. Addendum 1: Ergonomic requirements for flat panels (Standard No. ISO CD 9241-3 Add. 1:1993). Geneva, Switzerland: Author.
• [16] International Organization for Standardization (ISO). (1994). Ergonomic requirements for work with visual display units employing flat panel technology. Flat panel display ergonomic requirements (Standard No. ISO CD 13406-2:1994). Geneva, Switzerland: Author.
• [17] Kokoschka, S., & Haubner, P. (1985). Luminance ratios at visual display workstation and visual performance. Lighting Research and Technology, 17, 138.
• [18] Konarska, M., Widerszal-Bazyl, M., Roman, D., Wild, J., Wolska, A., Żołnierczyk, D., Bugajska, J., & Niesłuchowska, M. (1992). Evaluation of the work stress on the data entry VDT operators stand. In H. Luczak, A.E. Çakir, & G. Çakir (Eds.), Proceedings of Work with Display Units WWDU ’92, Berlin (pp. D7-D8). Berlin, Germany: Technische Universität Berlin.
• [19] Kwaskowski, A., & Mondelski, S. (Eds.). (1982). Badanie czynności układu wzrokowego [Measurements of visual functions]. In Kliniczne metody badania układu wzrokowego (Chap. 9, pp. 114-118). Warszawa, Poland: PZWL.
• [20] Larsen, S., Thoresen, M., & Thom, E. (1994). Methodological problems in the monitoring and analysis of multinational and multidisciplinary controlled studies: Experiences from the International MEPS Study. In A. Grieco, G. Molteni, E. Occhipinti, & B. Piccoli (Eds.), Proceedings of Work with Display Units WWDU ’94, Milan (Vol. 2, p. C3). Milan, Italy: Univesity of Milan.
• [21] Laubli, T., Hunting, W., & Grandjean, E. (1981). Postural and visual loads at VDT workplaces: II. Lighting conditions and visual impairments. Ergonomics, 24, 933-944.
• [22] London, R. (1991). Near point of convergence. In J.S. Kridge, J.S. Amos, & J.B. Bartlett (Eds), Clinical procedures in optometry (Chap. 9). Philadelphia, PA, USA: J.B. Lippincott.
• [23] London, R. (1991). Amplitude of accommodatioin. In J.S. Kridge, J.S. Amos, & J.B. Bartlett (Eds), Clinical procedures in optometry (Chap. 10). Philadelphia, PA, USA: J.B. Lippincott.
• [24] Marek, T., Noworol, C., Pieczonka-Osikowska, W., Przetacznik, J., & Karwowski, W. (1988). Changes in temporal instability of lateral and vertical phorias of the VDT operators. In F. Aghazadeh (Ed.), Trends in ergonomics/human factors F (pp. 283-289). Amsterdam, The Netherlands: North-Holland.
• [25] Matula, R.A. (1981). Effects of visual display units on the eyes: A bibliography (1972-1980). Human Factors, 23, 581-586.
• [26] Megaw, E.D. (1995). The definition and measurement of visual fatigue. In J.R. Wilson & E.N. Corlett (Eds.), Evaluation of human work. A practical ergonomics methodology (2nd ed., chap. 28, pp. 840-863). London, UK: Taylor & Francis.
• [27] Messite, J., & Baker, D.B. (1984). Occupational health problems in offices: A mixed bag. In B.G.E. Cohen (Ed.), Human aspects in office automation (pp. 7-14). Cincinnati, OH, USA: National Institute for Occupational Safety and Health.
• [28] North, R.V. (Ed.). (1993).Visual display units. In Work and the eye (Chap. 9, pp. 161-184). Oxford, UK: Oxford University Press.
• [29] Nyman, K.G., Knave, B.G., & Voss, M. (1985). Work with video display terminals among office employees. IV. Refraction, accommodation, convergence and binocular vision. Scandinavian Journal of Work, Environment & Health, 11(6), 483-487.
• [30] Piccoli, B. (1993). Eye discomfort and VDT work. In G. Salvendy & M. Smith (Eds.), Human-computer interaction: Applications and case studies (Vol. A, pp. 722-727). New York, NY, USA: Elsevier.
• [31] Pitts, D.G . (Ed.). (1993). Visual Display Terminals: Visual problems and solutions. In Environmental vision. Interactions of the eye, vision and environment (Chap. 15, pp. 333-349). Oxford, UK: Butterworth-Heinemann.
• [32] Polski Komitet Normalizacyjny (PKN). (1984). Oświetlenie wnętrz światłem elektrycznym [Electric lighting of interiors] (Standard No. PN-E-02033:1984). Warsaw, Poland: Wydawnictwa Normalizacyjne Alfa.
• [33] Rea M.S. (Ed.). (1993). Office lighting. Offices with Video Display Terminals. In Lighting handbook. Reference & application (Chap. 15, pp. 535-538). New York, NY, USA. Illuminating Engineering Society of North America.
• [34] Saito S. (1997). Recent advances in display technology and human factors. In H. Miyamoto, S. Saito, M. Kajiyama, & N. Koizumi (Eds.), Proceedings of Work with Display Units WWDU ’97, Tokyo (pp. 1-2). Tokorozawa, Japan: Waseda University.
• [35] Saito, S., Miyao, M., Kondo, T., Sakakibara H., & Toyoshima, H. (1997). Working posture of VDT operation using Flat Panel Display. In H. Miyamoto, S. Saito, M. Kajiyama, & N. Koizumi (Eds.), Proceedings of Work with Display Units WWDU ’97, Tokyo (pp. 163-164). Tokorozawa, Japan: Waseda University.
• [36] Shahnavaz, H. (1984). Visual accommodation changes in VDU-operators related to environmental lighting and screen quality. Ergonomics, 27(10), 1071-1082.
• [37] Stone, P.T., Clarke, A.M., & Slater, A.I. (1980). The effect of task contrast on visual performance and visual fatigue at a constant illuminance. Lighting Research and Technology, 12, 144-159.
• [38] Yeow, P.T., & Taylor, S.P. (1991). Effects of long-term Visual Display Terminal usage on visual functions. Optometry and Vision Science, 68(12), 930-941.
• [39] Wolska, A., Bugajska, J., & Konarska, M. (1994). Effectiveness of ergonomic intervention in subjective and objective evaluation of VDT data entry work. In A. Grieco, G. Molteni, E. Occhipinti, & B. Piccoli (Eds.), Proceedings of Work with Display Units WWDU '94, Milan (Vol. 2, pp. C10-C11). Milan, Italy: Univesity of Milan.