Conjunctival allergen provocation test : guidelines for daily practice.

Area of Science:

• Ophthalmology
• Allergology
• Clinical Immunology

Background:

• Allergic conjunctivitis is a common condition often diagnosed based on clinical history.
• Identifying specific allergens is crucial for effective management, especially in complex cases.
• The conjunctival allergen provocation test (CAPT) simulates ocular allergic reactions.

Purpose of the Study:

• To provide a comprehensive overview of the practical aspects of performing the conjunctival allergen provocation test (CAPT).
• To review the indications, contraindications, and prerequisites for safe and effective CAPT.
• To establish criteria for interpreting CAPT results in diagnosing IgE-mediated ocular allergies.

Main Methods:

• A systematic review and compilation of data from 131 papers focusing on the practical application of CAPT.
• Analysis of mechanisms, indications, contraindications, and procedural elements of CAPT.
• Review of diagnostic criteria and scoring systems for positive CAPT results.

Main Results:

• CAPT is indicated for diagnosing allergen triggers in various forms of allergic conjunctivitis, particularly when allergen relevance is unclear or in polysensitized patients.
• Contraindications are limited to severe systemic conditions, asthma, or active eye diseases; medication adjustments are necessary before the test.
• Positive CAPT results are determined by itching or a composite score, with an alternative based solely on itching.

Conclusions:

• The conjunctival allergen provocation test (CAPT) is a safe, simple, yet underutilized diagnostic tool for allergic conjunctivitis.
• Properly executed CAPT provides valuable clinical information for identifying specific allergen triggers.
• Adherence to established guidelines ensures the safety and efficacy of CAPT in clinical practice.