IGHE and atopic conjunctivitis: IgG levels demonstrated stronger correlations with SPT positivity (correlation coefficients r = 0.95–0.97 vs. r = 0.60–0.89 for IgE) and allergic conjunctivitis severity scores (r = 0.35–0.60 vs. r = 0.23–0.43 for IgE, p < 0.001).