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External lighting and the issues of mesopic vision DOI:10.15199/48.2019.11.60

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The Nobel Prize awarded in 2017 in the field of Physiology or medicine, revived questions about the impact on health and well-being of the human population, defined not only as of the intensity of illumination. One of the problems that have been raised is the correctness of the use of the same guidelines in photopic conditions as scotopic or mesopic. The limit of mesopic vision is determined for the luminance value 3 cd/m2. It is worth paying attention to the values specified in PN-EN 13201-2: 2016 for M classes, they are below this value. To determine the level of influence of changes in lighting conditions on the perception of the luminance value, you can use a factor S/P, defined later in this article. Photoreceptor cells Light-sensitive cells (specialised retinal neurons) divided into rods and cones. As a result perception of the electromagnetic wave in the visible range, i.e. 390 nm to 790 nm, photochemical cells produce two types of photosensitive pigment. Rhodopsin is produced in suppositories, while iodopsin in rods. The intensity of the secretion of individual pigments is closely related to the luminance reaching the retina of the eye. Based on the activity of individual photoreceptors, the following types of vision are discriminate: scotopic - focused on contrast, mesopic - transitional and photopic - designed for colour recognition. At the same time, as the intensity of light decreases, the ability to distinguish colours decreases. The more rods they take in recognising light stimuli, the more they darken the colour red, and the blue ones acquire brightness [1, 2]. The vision expressed in the equations Mathematically determine the amount of energy reaching the retina, values shall be calculated using standard quantities like luminous flux ϕe, luminous spectral efficiency function V(λ) and maximum of luminous efficacy of radiation Km: (1) 780 , 380   Km  e  [...]

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