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Related Experiment Videos

Do human tears absorb ultraviolet light?

P Michalos1, E N Avila, G J Florakis

  • 1Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University College of Physicians and Surgeons, New York, New York.

The CLAO Journal : Official Publication of the Contact Lens Association of Ophthalmologists, Inc
|July 1, 1994
PubMed
Summary
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Human tears transmit ultraviolet-A and ultraviolet-B light, offering potential protection against UV damage. This UV transmittance has implications for preventing eye damage and in laser eye surgery.

Area of Science:

  • Ophthalmology
  • Biophysics
  • Photobiology

Background:

  • The ocular surface is constantly exposed to ultraviolet (UV) radiation.
  • Understanding the UV-filtering properties of the tear film is crucial for ocular health.

Purpose of the Study:

  • To quantify the transmittance of ultraviolet light through human tears.
  • To explore the clinical relevance of tear film UV transmittance.

Main Methods:

  • Human tears were analyzed using ultraviolet (UV) spectrophotometry.
  • UV light transmittance was measured across UV-A, UV-B, and UV-C ranges.

Main Results:

  • Human tears readily transmitted UV-A (320-400 nm) and UV-B (290-320 nm) light.
  • Partial absorption of UV light was observed in the UV-C (100-290 nm) range.

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Conclusions:

  • Human tears possess UV-filtering capabilities, particularly against higher energy UV-C wavelengths.
  • Findings suggest implications for preventing phototoxic ocular damage and inform excimer laser corneal photoablative techniques.