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Diffuse solar UV radiation and implications for preventing human eye damage.

A V Parisi1, A Green, M G Kimlin

  • 1Center for Astronomy and Atmospheric Research, Faculty of Sciences, University of Southern Queensland, Toowoomba, 4350, Australia. parisi@usq.edu.au

Photochemistry and Photobiology
|March 29, 2001
PubMed
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Ocular UV exposure depends on direct and diffuse solar radiation. Diffuse ultraviolet radiation (UVB) was higher than ultraviolet A (UVA), especially in shade and during morning/afternoon periods.

Area of Science:

  • Ophthalmology
  • Environmental Science
  • Photobiology

Background:

  • Ocular UV exposure is influenced by both direct and diffuse solar radiation.
  • Understanding UV radiation components is crucial for eye health and protection strategies.

Purpose of the Study:

  • To quantify the direct and diffuse components of solar ultraviolet (UV) radiation.
  • To analyze UV exposure variations across different times of day and seasons.
  • To investigate UV radiation under full sun versus shaded conditions.

Main Methods:

  • Broadband global and diffuse UV measurements were conducted across morning, noon, and afternoon.
  • Measurements were taken in summer, autumn, winter, and spring, both in full sun and under the shade of Australian evergreen trees.

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  • Data collection involved 30 sets in summer and 50 sets in other seasons for each time period and condition.

    • Main Results:

    • The percentage of diffuse UV radiation was higher for UVB (320-400 nm) than for UVA (280-320 nm).
    • Diffuse UVB ranged from 23-59%, while diffuse UVA ranged from 17-31%.
    • Diffuse UV was lower at noon compared to morning and afternoon, particularly for UVB. In tree shade, average diffuse UVB was 62% (morning), 58% (noon), and 71% (afternoon); average diffuse UVA was 52% (morning), 51% (noon), and 59% (afternoon).

    Conclusions:

    • UV exposure assessment must consider both direct and diffuse radiation components.
    • Shaded environments, particularly under trees, significantly alter the proportion of diffuse UV radiation.
    • Time of day and season impact the ratio of diffuse to direct UV, with implications for ocular protection guidelines.