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Discomfort glare is a psychological sensation caused by high brightness (or brightness contrast) within the field of view, which does not necessarily impair vision. [2] In buildings, discomfort glare can originate from small artificial lights (e.g. ceiling fixtures) that have brightnesses that are significantly greater than their surrounding.
Computer Eye Syndrome is an umbrella term for many problems but the causes of these problems can be easily identified. When using a computer due to the size and setup of the monitor and components it is necessary for the user to be within at least two feet of the monitor when performing any type of computational work.
Ergonomic studies [4] show that prolonged work in the office environment with the presence of discomforting glares and disturbances from light reflections on the screen can cause mild to severe health effects, ranging from eye strain and headaches to photosensitive epileptic episodes. These effects are usually explained by the physiology of the ...
A number of computer and smartphone applications adjust the computer video color temperature, reducing the amount of blue light emitted by the screen, particularly at night. Dry eye is a symptom that is targeted in the therapy of CVS. The use of over-the-counter artificial-tear solutions can reduce the effects of dry eye in CVS.
Light sensitivity or photosensitivity refers to a notable or increased reactivity to light. Apart from vision , human beings have many physiological and psychological responses to light. In rare individuals an atypical response may result in serious discomfort, disease, or injury.
The computer screen in use should also be positioned in a way that it avoids glare from overhead lighting and windows. Using curtains or blinds on nearby windows, desk lamps, screen glare filters and switching overhead light bulbs to lower wattage bulbs can prevent the development of CVS.
For the simplified scenario of visible light travelling from air (n 0 ≈ 1.0) into common glass (n S ≈ 1.5), the value of R is 0.04, or 4%, on a single reflection. So at most 96% of the light (T = 1 − R = 0.96) actually enters the glass, and the rest is reflected from the surface. The amount of light reflected is known as the reflection loss.
Light ergonomics is the relationship between the light source and the individual. [1] Poor light can be divided into the following: Individual or socio-cultural expectations; Insufficient light; Poor distribution of light; Improper contrast; Glare; Flicker; Thermal heating (over or under) Acoustic noise (especially fluorescents)