Light the visible spectrum and beyond pdf download

The CIE defines two separate systems for measuring light: the photometric and the radiometric systems. The radiometric system is based upon fundamental physical units Table 1. The radiometric system is employed by physicists to quantify radiant energy independent of wavelength; whereas photometric quantities are only used for visible light, but radiometric quantities and units apply in the ultraviolet and infrared spectral regions as well.

The retinal irradiance E r is directly proportional to the radiance brightness L of the source being viewed. The retinal irradiance from ambient outdoor illumination is of the order of 0. It is hard to predict future developments in our understanding and use of light; hopefully not more blue light at night. Our understanding of the multiple roles of pRGCs has only begun. Sliney DH. Exposure geometry and spectral environment determine photobiological effects on the human eye.

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Military experience in night vision. Wald G. A priori assumption!. Science ; : Wolf E. Effects of exposure to ultra-violet light on human dark adapation. Proc Natl Acad Sci ; 32 : — Alleged effects of the near ultraviolet on human vision. J Opt Soc Am ; 42 : — Tan KEWP. Vision in the Ultraviolet. Elonkwijk Printers: Utrecht, the Netherlands, Energy, quanta and vision. J Gen Physiol ; 25 : Human infrared vision is triggered by two-photon chromophore isomerization.

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You can also search for this author in PubMed Google Scholar. Correspondence to D H Sliney. Reprints and Permissions. Sliney, D. What is light? The visible spectrum and beyond.

Eye 30, — Download citation. Received : 13 October Accepted : 15 October Published : 15 January Issue Date : February Anyone you share the following link with will be able to read this content:. Sorry, a shareable link is not currently available for this article.

Provided by the Springer Nature SharedIt content-sharing initiative. Advanced search. Skip to main content Thank you for visiting nature. Download PDF. Subjects Education Risk factors. Abstract In this International Year of Light, it is particularly appropriate to review the historical concept of what is light and the controversies surrounding the extent of the visible spectrum. Figure 1. Full size image. Figure 2. Figure 3. Figure 4.

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