Visual Comfort
Visual Comfort is used to rate the lighting scenes. It is the percentage of light required so that people will feel comfortable with regards to visual glare. It tries to understand the human interactions and visual processes. The visual comfort and safety is very important.
Human beings can easily adapt to the environment. Light is the key element is our capacity to see so we should appreciate the form, colour and perspective of the objects we see around us. Most of the information we obtain is through sight. The lighting even affects our mind and thought processes. The correct design of illumination system offers visual comfort. The distribution of the luminance, the efficiency of the illumination and the spectral composition affects the visual comfort.
Visual comfort affects the productivity and physiological well being of any worker that is why proper colours of walls and furniture are chosen with great efforts while designing any workplace. The combination of illumination, the contrast of the luminance, the colour of light, reproduction of colour and selection of the colours are different elements which affect visual comfort.
Factors affecting visual comfort
The factors that affect visual comfort are uniform illumination, optimal luminance, lack of glare, adequate contrast conditions, correct colours and the absence of intermittent light. Light should not only be considered by quantitative criteria but also by qualitative criteria.
Each activity requires a specific level of illumination in the area where the activity takes place. In general, the higher the difficulty for visual perception, the higher the average level of illumination should be as well. Level of Illumination is affected by the nature of the work, reflectance of the object and of the immediate surroundings differences with natural light and the need for daytime illumination and the worker’s age.
The degree of safety with which a task is executed depends, in large part, on the quality of illumination and on visual capacities. The visibility of an object can be altered in many ways. One of the most important is the contrast of luminances due to reflection factors, to shadows, or to colours of the object itself, and to the reflection factors of colour. What the eye really perceives are the differences of luminance between an object and its surroundings, or between different parts of the same object. The luminance of an object, of its surroundings, and of the work area influence the ease with which an object is seen. It is therefore of key importance that the area where the visual task is performed, and its surroundings, be carefully analysed.
Factors that affect Vision
Key factors in the conditions that affect vision are the distribution of light and the contrast of luminances. In so far as the distribution of light is concerned, it is preferable to have good general illumination instead of localized illumination in order to avoid glare. For this reason, electrical accessories should be distributed as uniformly as possible in order to avoid differences in luminous intensity. Constant shuttling through zones that are not uniformly illuminated causes eye fatigue, and with time this can lead to reduced visual output.
Glare
Glare is produced when a brilliant source of light is present in the visual field; the result is a diminution in the capacity to distinguish objects. Workers who suffer the effects of glare constantly and successively can suffer from eye strain as well as from functional disorders, even though in many cases they are not aware of it.
Glare can be direct when its origin is bright sources of light directly in the line of vision, or by reflection when light is reflected on surfaces with high reflectance. Distribution of luminance among different objects and surfaces: The greater the differences in luminance are among the objects within the field of vision, the greater will be the glare created and the greater will be the deterioration in the capacity to see due to the effects on the adaptive processes of sight.
Human beings can easily adapt to the environment. Light is the key element is our capacity to see so we should appreciate the form, colour and perspective of the objects we see around us. Most of the information we obtain is through sight. The lighting even affects our mind and thought processes. The correct design of illumination system offers visual comfort. The distribution of the luminance, the efficiency of the illumination and the spectral composition affects the visual comfort.
Visual comfort affects the productivity and physiological well being of any worker that is why proper colours of walls and furniture are chosen with great efforts while designing any workplace. The combination of illumination, the contrast of the luminance, the colour of light, reproduction of colour and selection of the colours are different elements which affect visual comfort.
Factors affecting visual comfort
The factors that affect visual comfort are uniform illumination, optimal luminance, lack of glare, adequate contrast conditions, correct colours and the absence of intermittent light. Light should not only be considered by quantitative criteria but also by qualitative criteria.
Each activity requires a specific level of illumination in the area where the activity takes place. In general, the higher the difficulty for visual perception, the higher the average level of illumination should be as well. Level of Illumination is affected by the nature of the work, reflectance of the object and of the immediate surroundings differences with natural light and the need for daytime illumination and the worker’s age.
The degree of safety with which a task is executed depends, in large part, on the quality of illumination and on visual capacities. The visibility of an object can be altered in many ways. One of the most important is the contrast of luminances due to reflection factors, to shadows, or to colours of the object itself, and to the reflection factors of colour. What the eye really perceives are the differences of luminance between an object and its surroundings, or between different parts of the same object. The luminance of an object, of its surroundings, and of the work area influence the ease with which an object is seen. It is therefore of key importance that the area where the visual task is performed, and its surroundings, be carefully analysed.
Factors that affect Vision
Key factors in the conditions that affect vision are the distribution of light and the contrast of luminances. In so far as the distribution of light is concerned, it is preferable to have good general illumination instead of localized illumination in order to avoid glare. For this reason, electrical accessories should be distributed as uniformly as possible in order to avoid differences in luminous intensity. Constant shuttling through zones that are not uniformly illuminated causes eye fatigue, and with time this can lead to reduced visual output.
Glare
Glare is produced when a brilliant source of light is present in the visual field; the result is a diminution in the capacity to distinguish objects. Workers who suffer the effects of glare constantly and successively can suffer from eye strain as well as from functional disorders, even though in many cases they are not aware of it.
Glare can be direct when its origin is bright sources of light directly in the line of vision, or by reflection when light is reflected on surfaces with high reflectance. Distribution of luminance among different objects and surfaces: The greater the differences in luminance are among the objects within the field of vision, the greater will be the glare created and the greater will be the deterioration in the capacity to see due to the effects on the adaptive processes of sight.
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