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Screening procedures for eye irritation

P M Hurley1, W A Chambers, S Green

  • 1US Environmental Protection Agency, Washington, DC 20460.

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association
|February 1, 1993
PubMed
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Screening methods can reduce the need for in vivo eye irritation tests. While participants agreed on using screens, opinions on specific methods, especially in vitro systems, varied.

Area of Science:

  • Toxicology
  • Dermatology
  • Ophthalmology

Background:

  • In vivo eye irritation testing, particularly using rabbits, faces ethical and regulatory scrutiny.
  • Alternative methods are sought to predict ocular irritation potential efficiently and ethically.

Purpose of the Study:

  • To propose and evaluate a stepwise screening strategy for assessing ocular irritation potential.
  • To reduce reliance on traditional animal testing for eye irritancy.

Main Methods:

  • Evaluation of product pH extremes (≤2 or ≥11.5) as indicators of ocular irritation.
  • Utilizing structure-activity relationships (SAR) to predict irritation potential.
  • Considering severe acute dermal toxicity (LD50 ≤ 200 mg/kg) and primary dermal irritation index (≥5) as exclusion criteria for further eye testing.

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  • Assessing the potential role of validated in vitro systems.
  • Recommending rabbit eye testing only for substances not eliminated by the proposed screens.

    • Main Results:

    • A high percentage of workshop participants supported the use of screening methods.
    • Opinions on individual screening methods varied among different stakeholder groups.
    • The potential future use of in vitro screens showed the highest agreement (57-100%) for specific product lines.

    Conclusions:

    • A tiered screening approach can effectively identify substances unlikely to cause ocular irritation, thereby minimizing animal testing.
    • Further development and validation of in vitro methods are crucial for widespread adoption.
    • Consensus on specific screening protocols requires continued dialogue among diverse interest groups.