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it are unknown. The muscles located at the iris have been identified as the source of discomfort and even still scientists are not sure if this is the case. The more the luminance of the glare increases, the more the observer feels uncomfortable. This effect is also experienced when the angular size of the object causing glare at the eye (Hopkins and Collins, 1970). The feeling of discomfort reduces as luminance of the background is increased together with the angular position of the source of glare. Discomfort is relative by definition and the amount of discomfort glare cannot be easily quantified. Given a test situation, a specific amount of physical configuration of light will affect different amount of discomfort to different individuals. Despite the many years of research that has been carried out in this universe it is still unclear how size, position, glare source luminance and luminance of the background interact.

 

Finally, the underlying consequences of relatively less amount of discomfort glare are still unknown to date. A person's notion of what of the required amount of glare will depend on the thing he is doing and the kind of interest he has in it.

 

There is going to be need for evaluation of the visual environment for an effective design of ergonomics at work place and also for practical application of safety rules.

 

The next aspect of ergonomics at the place of work is the thermal environment. This can comfortably be divided into cold, neutral and warm. The available ergonomics technique of evaluating thermal environments is divided into objective, subjective and mathematical techniques. In the measure of body strain, important aspects such as internal body temperature, temperature of the skin, the rate at which the heart beats and sweat rate become handy. It is of great importance to evaluate the mechanisms behind human reaction to thermal environments. It is a known fact that there exist important features that have an effect on how human beings respond to their thermal environment. These features are air velocity, humidity, air temperature, the worn cloth and the activity carried out by the individual. These factors can be quantified and measured given any practical assessment. Human beings tend to respond to thermal stimuli in a way that sustains the temperature of their body to a certain level (approximately 370C). Response of the human body to changes in environmental temperature can lead to very serious practical consequences. Acute changes to body temperature can make an individual to be confused, fall down or even die. Sweat causes a feeling of stickiness and the individual becomes uncomfortable. This may lead to inefficient performance and also lack of concentration in the work place. A very important instrument that is used to explain and design and evaluate thermal settings is the thermal index. Its objective is that a value in its calibration varies as the response of the individual varies.

 

In the study of the assessment of the environment, the ergonomist ought to know that human beings are 本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。