方法：回顾性分析2017-06/2019-06于本院就诊的蠕形螨感染所致睑缘炎患者120例240眼临床资料，按照使用茶树精油浓度10%、15%、20%、25%将患者分4组，每组各30例60眼。给予所有患者睑板腺按摩、睑缘清洁，再用不同浓度的茶树精油擦洗清洁睑缘。比较各组治疗前、治疗2、4wk后蠕形螨数量、临床症状评分、临床体征评分、泪膜破裂时间(BUT)、角膜荧光素染色(FL)和泪液分泌试验(SⅠt)差异。

结果：四组患者治疗前蠕形螨数量、临床症状评分、临床体征评分、BUT、FL和SⅠt比较均无差异(P>0.05)。治疗后，各组患者蠕形螨数量、临床症状评分、临床体征评分均较治疗前降低，且各组治疗4wk后蠕形螨数量、临床症状评分、临床体征评分均低于治疗2wk后(均P<0.008)。治疗2、4wk后各组间蠕形螨数量、临床症状评分、临床体征评分以10%茶树精油组最高，25%茶树精油组最低(均P<0.008)。治疗后各组BUT较治疗前升高，并于第4wk达到峰值。治疗2、4wk后各组间BUT以25%茶树精油组最高、10%茶树精油组最低(均P<0.008)。治疗后各组FL、SⅠt较治疗前降低，并于第4wk达到最低值。治疗2、4wk后各组间FL均以25%茶树精油组最低、10%茶树精油组最高(均P<0.008)。

结论：与10%茶树精油组相比，15%茶树精油组可有效驱螨、缓解蠕形螨睑缘炎患者临床症状和眼部体征，且安全性高于20%、25%茶树精油组，可作为抗蠕形螨睑缘炎茶树精油的首选浓度。

METHODS: The clinical data of 120 patients(240 eyes)with blepharitis caused by Demodex infection in our hospital from June 2017 to June 2019 were retrospectively analyzed. According to the use of tea tree essential oil concentrations of 10%, 15%, 20% and 25%, patients were divided into 4 groups(group A, group B, group C, group D), each group with 30 people. All patients were given meibomian gland massage, eyelid margin cleaning, and then scrubbed with different concentrations of tea tree oil to clean the eyelid margin. The number of demodex mites, clinical symptom score, clinical sign score, tear film break-up time(BUT), corneal fluorescein staining(FL)and SchirmerⅠtest(SⅠt)were compared before and 2, 4wk after treatment.

RESULTS: The number of Demodex mites, clinical symptom score, clinical sign score, BUT, FL and SⅠt were not statistically significant in the four groups before treatment(P>0.05). After treatment, the number of Dmodex mites, clinical symptom score, and clinical sign score in each group were lower than those before treatment, and the number of Demodex mites, clinical symptom score, and clinical sign score after 4wk of treatment in each group were lower than those after 2wk of treatment(all P<0.008). After 2 and 4wk of treatment, the number, clinical symptom score and clinical signs score of Demodex mites in group A were the highest, while those in group D were the lowest(all P<0.008). After treatment, the BUT of each group was higher than before treatment, and reached the peak in the 4wk. After 2 and 4wk of treatment, BUT among groups was highest in group D and lowest in group A(all P<0.008). After treatment, FL and S I t of each group were lower than before treatment, and reached the lowest value in the 4wk. After 2 and 4wk of treatment, FL among the groups was the lowest in group D and the highest in group A(all P<0.008).

CONCLUSION: Compared with 10% tea tree essential oil, 15% tea tree essential oil can effectively repel mites, relieve clinical symptoms and eye signs in patients with Demodex blepharitis, and is safer than 20% and 25% tea tree essential oils. As the preferred concentration of tea tree essential oil against Demodex blepharitis.