Visual efficiency & comfort - Printable Version

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Visual efficiency & comfort - harshita - 06-05-2019

Visual efficiency & comfort
For practical purpose visual efficiency of person depends on level of illumination and ability to see objects in three facet

1. Visual acuity (VA) Sharpness of Vision
   
2. Contrast sensitivity (CS)
   
3. Visual performance
   

Visual acuity measured as reciprocal of visual angle ρ (in minutes) subtended at eye by the least perceptible detail
Contrast sensitivity =  (Least  perceptible luminence difference (L2-L1) / Lower luminence (L1) ) X 100%
Visual performance time required for seeing expressed possibly as number of characters perceived per second
Glare considered as a comfort parameter, is the unpleasant effect caused by an excessive contrast of luminance in the visual field. Glare is a condition of vision in which there is discomfort or a reduction in the ability to see significant objects or both due to an unsuitable distribution or range of luminance or due to extreme contrasts in space and time.

To know more about illumination read .... Visual efficiency & comfort
Illumination in architecture

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