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...of their VDT-using patients to environmental factors: lighting, poor screen re...ric Association survey, the major environmental causes of VDT-related eye prob...

... aches, photophobia (unusual sensitivity to light), double vision, and afterimages are the most common side effects of extended VDT work. Other symptoms include blurred distance vision, crossed eyes, and-in some cases-the McCullogh effect, ' in which white objects appear pink after using a VDT (This usually clears up within minutes) . Optometrists attribute CVS symptoms among nearly 40% of their VDT-using patients to environmental factors: lighting, poor screen resolution, glare, and so forth. To that list, we can add such contributing factors as poor workstation design and extended hours of uninterrupted terminal time. Flicker can also be a significant cause of eye fatigue among computer users. Most cathode ray tube (CRT) monitors repaint the screen 60 times per second (or 60 Hz) which is generally considered ... or users in harsh lighting conditions should consider mesh. The only way to know if a filter will meet your needs is to work with it on your computer for a few days. To help consumers make a more educated decision, the American Optometric Association (AOA) has begun a Seal of Certification and Acceptance program to judge the effectiveness of filters. So far only one company, Optical Coating Laboratory, Incorporated (OCLI), has submitted its products for review. All the OCLI filters have received the AOA seal. Virtually every filter manufacturer offers both mesh and glass products. Along with reducing glare, some filters are supposed to cut static, which means they prevent charged dust particles from collecting on the surface of the monitor. Others claim to block potentially harmful electromagnetic emissions. However, ...