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Measurement of Photobiological Exposure of Ocular Tissues

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Biologic Effects of Light 2001

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Abstract

Because of a number of geometrical shading factors, such as the eyelids and brow ridge, the human eye is actually exposed to a very small fraction of incident ultraviolet radiation (UVR). The retina is exposed to visible light and some IR-A radiant energy within an imaged scene. These geometrical and imaging factors challenge the task of attempting to accurately measure the photobiologically significant exposure of the cornea, lens and retina to ultraviolet, visible and infrared radiation.

The lid opening varies with ambient scene luminance (brightness). It is possible to mathematically predict the opening of the lids and the angular field-of-view from our studies of lid opening. This aids in setting the field-of-view of measurement instruments designed to measure the UVR exposure dose to the cornea and lens. We have measured the UV exposure to the anterior segment of the eye as would occur when a person wears different types of sunglasses. The exposure is greatly affected by the type of sunglass frame and partially to the UV transmittance of the sunglass lenses. In some instances, UV exposures of some specific ocular tissues can actually equal or exceed those when not wearing sunglasses.

The light exposure to the retina is not at all uniform in outdoor daylight conditions. The central and superior regions of the retina receive much more light than the inferior retina. Thus instrumentation should simulate these geometrical factors.

Instrumentation designed to determine the photobiological dose to ocular tissues must therefore have acceptance field-of-views that mimic those of the human eye.

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Authors and Affiliations

  1. US Army Center for Health Promotion and Preventive Medicine, Aberdeen Proving Ground, MD, USA

    David H. Sliney Ph.D.

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  1. David H. Sliney Ph.D.
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  1. Boston, Massachusetts, USA

    Michael F. Holick

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© 2002 Springer Science+Business Media New York

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Sliney, D.H. (2002). Measurement of Photobiological Exposure of Ocular Tissues. In: Holick, M.F. (eds) Biologic Effects of Light 2001. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0937-0_3

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  • DOI: https://doi.org/10.1007/978-1-4615-0937-0_3

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4613-5313-3

  • Online ISBN: 978-1-4615-0937-0

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