Building Physics: Lighting. Seeing in the Artificial by W. R. Stevens

By W. R. Stevens

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Extra resources for Building Physics: Lighting. Seeing in the Artificial Environment

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S. Code this basis of calculation leads, for example, to a recommended glare index of not more than 19 for general offices and 28 for machine shops where rough work is done (see Chapter 5). FATIGUE, VISUAL DEFECTS, AGE If the lighting is poor the user may tire more quickly than if it is good. This is due to tiring of the muscles controlling the eye and eye ball and not to some mysterious deterioration in lens, retina or nervous system. Probably even more serious is fatigue due to poor posture induced by getting too close to the work or adopting some awkward attitude in order to see better.

There are not "more greens" than there are "more yellows". Nor are the boundaries of colours defined sharply as shown. The boundaries merge t Commission Internationale de l'Eclairage. LIGHT: ITS BEHAVIOUR AND HOW IT IS MEASURED 49 imperceptibly: but in a specification some arbitrary boundary will be fixed and indicated substantially as shown. The diagram indicates hue (or dominant wavelength) and saturation (intensity of colour). It does not indicate luminance (or amount of light). Thus black, grey, white are all given the FIG.

Short sight (myopia) and long sight (hypermetropia), if uncorrected by lenses, must lead to fatigue due to over-exertion of the muscles attempting to correct the defect. Similarly, other troubles such as squinting or faulty mechanism for accommodation and convergence may show more seriously in poor lighting than good. Increasing age also brings limitations of vision which can be alleviated to some extent by good lighting. The near point of distinct vision recedes with age and a given linear size of detail, therefore, appears smaller.

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