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Edema test for assessing ocular anaphylaxis

R S Baird, K J Bloch, M R Allansmith

    Current Eye Research
    |January 1, 1982
    PubMed
    Summary
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    Measuring conjunctival thickness is a simpler, faster, and more cost-effective method for assessing ocular anaphylaxis in rats compared to evaluating mast cell degranulation. This technique reliably indicates the severity of the allergic reaction.

    Area of Science:

    • Ophthalmology
    • Immunology
    • Allergy Research

    Background:

    • Ocular anaphylaxis is a significant allergic reaction affecting the eye.
    • Accurate and efficient methods are needed to measure the severity of ocular allergic responses.
    • Mast cell degranulation is a key indicator of allergic reactions.

    Purpose of the Study:

    • To develop and validate a novel technique for measuring conjunctival thickness as an indicator of ocular anaphylaxis.
    • To compare the efficacy of conjunctival thickness measurement with mast cell degranulation assessment.
    • To establish a simpler, faster, and less expensive method for evaluating topical ocular anaphylaxis.

    Main Methods:

    • A topical ocular anaphylaxis model was induced in rats using egg albumin.

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  • Conjunctival thickness was measured in antigen-challenged and control eyes.
  • The percentage of degranulated mast cells in ocular tissues was determined.
  • Correlation between conjunctival thickness and mast cell degranulation was analyzed.

    • Main Results:

    • Antigen challenge led to significant increases in both conjunctival thickness and mast cell degranulation compared to buffer challenge.
    • No visible clinical signs of edema or erythema were observed.
    • Conjunctival thickness showed a significant positive correlation with mast cell degranulation.
    • The conjunctival thickness measurement proved to be a reliable indicator of anaphylaxis.

    Conclusions:

    • Increased conjunctival thickness is a valid and reliable indicator of topically induced ocular anaphylaxis in rats.
    • Measuring conjunctival thickness offers a more practical and economical alternative to mast cell degranulation assessment for evaluating ocular allergic responses.