Human Factors Issues of Glare :: Optometry Vision Glare Essays

Human Factors Issues of GlareThe problem of public eye affects whole individuals. Although it is usually only a fleeting annoyance, glare can direct grave consequences. For instance, problems caused by glare from computing device screens account for 10 zillion optometrist examinations per year (Berman, 1998). There are two types of glare tenderness glare and disability glare. The types of glare are distinguished by their origin. provocation glare comes from an external source it is the physical sensation one experiences in the presence of a light source that is too bright. An example of annoyance glare is the experience of stepping outside on a bright solar day just after leaving a dark movie theater. Surfaces much(prenominal)(prenominal) as snow and sidewalks can cause discomfort glare (Ludt, 1997). excitation glare affects everyone. Disability glare, however, has an internal source. It is intrinsic to the individual due to develop or disease. Disability glare refers to intraocular scattering of light that interferes with normal opthalmic functioning by decreasing image contrast on the retina. These individuals gestate a debilitating sensitivity to high levels of illumination. Streetlamps, floodlights, and the sun are examples of perfunctory encounters that can induce, and require recovery time from, disability glare. The pervasive and subtle nature of glare demands additional research. This paper examines discomfort glare, disability glare, the reasons why they warrant further research, and the direction of this research.Because discomfort glare refers to reflection sources in the field of vision, the most simple way to guard against discomfort glare is to modify the environment. Some of the sources of discomfort glare are the sun, unshielded streetlamps, floodlights, computer screens, and parabolic luminaires. When the sun is low on the horizon, early in the first light and at crepuscle, discomfort glare peaks because the suns illumination is much brighter than other objects and these objects become difficult to see. (Ludt, 1997). Protective gear may be sufficient to counteract the overhead rays of the sun in between dusk and dawn. A remedy for discomfort glare caused by the sun is scarcely to wear a visor while outdoors. A brim that extends 3 inches forward should block light from entering the pupil. Sunglasses with yellow, orange, or blood-red tinted lenses may decrease discomfort glare (Ludt, 1997).Unshielded streetlamps, or semi-cutoff luminaires, give out to make streets safer because their high-wattage bulbs shine light throughout the entire surrounding area. abounding cutoff optics are a less bright and ultimately safer alternative.