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Corneal Damage Effects Induced by a 770-2,500 nm Supercontinuum Light Source.

Luguang Jiao1, Yan Fan1, Jiarui Wang1

  • 1Beijing Institute of Radiation Medicine, Beijing, People's Republic of China.

Lasers in Surgery and Medicine
|November 13, 2019
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Supercontinuum (SC) sources may harm eyes. Researchers determined rabbit corneal injury thresholds for SC radiation, finding existing safety limits for the 700-1,200 nm range are too strict.

Keywords:
corneal damagesafety standardsupercontinuumthreshold

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Area of Science:

  • Ophthalmology
  • Biomedical Optics
  • Laser Safety

Background:

  • Supercontinuum (SC) sources are increasingly used in various applications.
  • Potential for ocular damage from SC sources is a growing concern.
  • Corneal damage effects from SC radiation have not been previously investigated.

Purpose of the Study:

  • To establish the corneal injury threshold for supercontinuum (SC) radiation in a rabbit model.
  • To evaluate the adequacy of current safety guidelines for SC hazard assessment.
  • To compare SC damage thresholds with existing exposure limits.

Main Methods:

  • Experiments conducted on New Zealand white rabbits using a 770-2,500 nm SC source.
  • Corneal damage thresholds determined via slit-lamp biomicroscopy, optical coherence tomography (OCT), and histopathology.
  • Analysis of action spectra and comparison with safety standards to assess exposure limits.

Main Results:

  • Corneal damage thresholds for SC radiation were determined for 2.0 and 10.0-second exposures.
  • Thresholds were 2.1 × 10³ J/cm² and 7.4 × 10³ J/cm², respectively.
  • Damage at threshold levels primarily affected the corneal epithelium and superficial stroma.

Conclusions:

  • Existing safety exposure limits for the 700-1,200 nm range for anterior eye structures are overly conservative for SC sources.
  • The study provides crucial data for the hazard evaluation of supercontinuum sources.
  • Findings contribute to refining laser safety standards for novel light sources.