Light & Vision

5 important questions on Light & Vision

What is active when there is very little light available (luminance is low)?

Rods are active. This phenomenon is called scotopic vision: the luminance of a surface is, in that case, less then 0.035 cd/m2

To distingish objects and form, contrast s needed. There are two types of contransts: luminance contrast and color contrast. What are the two different formulas for luminous contrast.

C = (L_o-L_b)/L_b
C = L_max/L_min

What is direct glare:

Presence of a bright light source or windows in the field of view or in the vicinity of the viewing direction.
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What is glare by reflection?

Caused by reflection of light sources in reflective surfaces, especially if the reflections occur at or near the visual task

What is visual acuity?

A good focus of the image on the retina and sufficient light is necessary to see an object sharp

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