Background:The location of facial port-wine stain (PWS) may be helpful for predicting some associated anomalies;high glaucoma incidence is found in patients with eyes close to PWS-affected areas (V1,ophthalmic branch area of the trigeminal nerve).This study aimed to investigate the characteristics of glaucoma in V1-affected PWS.Methods:A total of 569 patients with V1 area-affected PWS were reviewed in the study.The large series was based on the referral system between the Department of Plastic and Reconstructive Surgery and the Department of Ophthalmology.All patients were screened for glaucoma with assessments of intraocular pressure,cup-to-disc ratio,comeal diameter (only for infants),and axial length.Results:Of the 569 patients,110 (19.3％) patients had glaucoma.Among the patients,18.1％ (76/420) had early-onset glaucoma (under 4-year-old group).In the 4 to 18-year-old age group,29.3％ (29/99) of the patients had glaucoma.Compared with right lateral and bilateral PWS,left-sided PWS had a lower risk of glaucoma in this study (odds ratio =0.432 [95％ confidence interval,0.264-0.706],P =0.01).The under 4-year-old group showed a slight predominance of males (61.8％) in glaucoma.Conclusions:High glaucoma incidence was observed in patients with eyes close to PWS.More attention should be paid to glaucoma screening for right lateral and bilateral PWS patients.The predominance of males in Sturge-Weber syndrome (SWS) early-onset glaucoma patients might be due to the limitation of the case number;however,it might also provide us a new clue of potential relationship between SWS and PCG.