Conjunctival redness is an objective allergy symptom which can be analyzed using objective computer imaging methods. To evaluate allergic inflammation of the eyes, a robust and precise image-based method was developed and applied to analyze allergic hyperemia under the conjunctival provocation test (CPT). High-resolution digital photos were taken and analyzed via digital analysis software to obtain and document conjunctival redness. The evaluations made using this newly developed image-based method concurred with the study investigators' assessments: the therapeutic effects of the highest doses were superior to the lowest dose.