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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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UV–Vis Spectrum01:30

UV–Vis Spectrum

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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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UV–Vis Spectroscopy of Conjugated Systems01:32

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in...
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UV Index Does Not Predict Ocular Ultraviolet Exposure.

Natsuko Hatsusaka1,2, Yusuke Seki1, Norihiro Mita1

  • 1Department of Ophthalmology, School of Medicine, Kanazawa Medical University, Kahoku, Ishikawa, Japan.

Translational Vision Science & Technology
|June 1, 2021
PubMed
Summary
This summary is machine-generated.

The new Ocular Ultraviolet (OUV) index warns of eye UV exposure risks, unlike the standard Ultraviolet Index (UVI). This tool helps prevent UV-induced eye diseases by providing better public warnings.

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Area of Science:

  • Ophthalmology
  • Environmental Health
  • Photobiology

Background:

  • The standard Ultraviolet Index (UVI) measures sunburn risk but omits eye exposure.
  • Ocular ultraviolet (OUV) exposure poses significant risks for eye diseases.
  • A need exists for a public warning system specifically for ocular UV exposure.

Purpose of the Study:

  • To develop a novel instrument for warning the public about OUV exposure.
  • To create a research tool for studying UV-induced ocular diseases.

Main Methods:

  • A rotating model head with UVB sensors measured UV irradiance at eye level across different times and seasons.
  • UV doses were mathematically transformed to create an OUV index (0-13+).
  • OUV index levels were compared with standard UVI readings.

Main Results:

  • Ocular UV exposure is higher during low solar altitudes (morning/afternoon) compared to peak sun.
  • The OUV index registered higher levels than the UVI in summer (low altitude) and significantly higher levels throughout winter.
  • UV exposure at the crown differs from ocular exposure, with eyes being more vulnerable at lower solar altitudes.

Conclusions:

  • The UVI is insufficient for warning about ocular UV damage risks.
  • The developed OUV index effectively warns the public about OUV exposure.
  • The OUV index serves as a valuable tool for researching UV-related ocular conditions.