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This paper is concentrated on influences of visual display terminals VDTs on its user In the previous research Reznik 2001 Humanities 2001 I have found that VDTs are indeed causes different eye problems This paper will accomplish further research and find ways to eliminate vision problems In an article by David Thomson Eye problems and Visual Display Units - facts and the fallacies the author discusses only Cathode Ray Tube CRT monitors which were the most used monitors before Liquid Crystal Displays LCDs came in to use A CRT is a an evacuated glass tube with a phosphorcoated screen at one end and a flament and deflection coils at the other Electrons emitted by the filament and accelerated focused and deflected by the action of the deflection coils The electron beam strikes the screen at the other end of the tube and at the point of impact phosphor emits light Thomson 1998 Thus digital images are created LCDs advantages are that it is flicker-free meaning it does not need to refresh its display because it is using liquid crystals which updates the data shown on the monitor automatically Also LCDs have adjustable luminanace that does not affect the size of the pixel smallest displayable square unit CRTs refresh rate varies from display to display and by adjusting the luminance you have to change the size of the pixel and that of course leads to not precisable appearance of data on the VDT In the article by M Menozzi CRT versus LCD effects of refresh rate display technology and background luminance in visual performance two experiments were carried out to find difference in influence on ones vision by a CRT and an LCD visual display terminals In the first experiment - tested subjects performance while performing a visual search using an LCD and a CRT with varying refrsh rates 48 - 75 Hz The subjects task consisted of detecting a target character among distractor characters presented
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