ABSTRACT
[Objective]To evaluate the efficacy of topical use of 1 g/L tacrolimus eye drops in the treatment of ocular alkali burns.[Methods]A prospective study was performed to evaluate the efficacy of 1 g/L tacrolimus eye drops in the treatment of 12 patients with ocular alkali burns admittedin Zhongshan Ophthalmic Center of Sun Yat-sen University between May 23,2016 and Jan-uary 18,2017. The patients were treated for 1 ~ 18 weeks,with an average of 8.91 ± 5.56 weeks.The degree of ocular alkali burns was evaluated according to Roper-Hall classification system. In this group of patients,there were 2 cases of gradeⅡburns,5 cases of gradeⅢburns and 5 cases of gradeⅣburns. Each patient was given 1 g/L tacrolimus eye drops 2 times a day after admission. The slit lamp microscope and corneal fluorescein sodium staining examination were performed before and 1th week,2nd week,3rd week, 4th week,6th week,8th week respectively after performing topical tacrolimus treatment. Photos were taken to keep records to dynami-cally observe the epithelial repair and anterior segment lesions. Adobe Photoshop CS6 image processing software was used to calculate the area of corneal epithelium repair. The therapeutic effect was evaluated according to the corneal epithelial repair ,visual acuity and complications. The statistical analysis was carried out by SPSS 19.0 software.[Results]4 cases reached good prognosis ,including 2 cases of gradeⅡ and 2 cases of gradeⅢ burns,the corneal epithelium healed and the visual acuity was greater than 0.3. 5 cases had guarded prognosis,including 3 cases of gradeⅢand 2 cases of gradeⅣburns,corneal epithelium healed in 2 cases,corneal epi-thelial repair rate was greater than 50%in 3 cases,in which corneal neovascularization or corneal conjunctiva occurred,and the visu-al acuity was less than 0.3. 3 cases of gradeⅣ burns had poor prognosis:1 had corneal perforation,1 had long term corneal ulcer, and 1 had secondary glaucoma. In 12 cases,the corneal epithelial healing rate reached 99% in 50% patients,and the healing rate was greater than 50%in 75%patients. The visual acuity of 33.3%patients increased by more than three lines,and 66.6%cases had complications. The main factors affecting the prognosis are:The degree of corneal and corneal limbal burns,complication and corneal epithelial repair rate.[Conclusion]1 g/L tacrolimus eye drops can reduce the inflammatory reaction of ocular alkali burns ,reduce the incidence of glaucoma,promote corneal ulcer healing and corneal epithelial repair,and reduce complications caused by corneal lim-bal burns.
ABSTRACT
Background The pathological basis of human primary open angle glaucoma mainly is the degeneration of trabecular meshwork and Schlemm canal.As the outflow pathway of aqueous humor, the tissue origin and characteristics of trabecular meshwork remain less clear.Studying the characteristics of trabecular meshwork may contribute a new thought to the treatment of primary open angle glaucoma.Objective This study was to explore the histological property of trabecular meshwork by detecting the expression of D2-40, a lymphatic biomarker,and CD31,CD34 and smooth muscle actin (SMA), some vascular endothelial biomarkers.Methods Twenty specimens of adult eyeballs were collected from Zhongshan Ophthalmic Center of Sun Yat-sen University,including l0 eyeballs from accident death donors,3 enucleated eyeballs due to posterior segment of choroidal malignant melanoma and 7 orbital exenterated eyeballs.The series ocular meridian sections with the thickness of 4 μm were prepared for the haematoxylin-eosin staining.Immunohistochemistry was employed to detect the expression of D2-40,CD31 ,CD34 and SMA in trabecular meshwork and Schlemm canal.Results Intact structure of chamber angle was observed under the optical microscope by haematoxylin-eosin staining.Human trabecular meshwork tissue was presented with meshlike structure,while Schlemm canal showed the lumen structure.No abnormal substance and periphery synechia were found.D2-40 was strongly expressed in the trabecular meshwork endothelial cells with staining score for 3 points, but CD31, CD34 and SMA were negatively expressed.In contrast, CD31, CD34 and SMA rather than D2-40 were positively expressed in the Schlemm canal.In addition, CD31 and CD34 were also positively expressed in the vascular endothelial cells around the trabecular meshwork.Conclusions The trabecular meshwork expresses lymphatic biomarker rather than vascular biomarkers.This result indicates that trabecular meshwork of human eyes is lymphatic vessel-like tissue.