With the increasing popularity of intraoperative optical coherence tomography (iOCT) equipment, the use of iOCT for a variety of fundus diseases is gradually increasing. Most clinical studies on iOCT have a small number of samples and lack of control, and the level and quality of evidence are generally not good. Therefore, the evaluation of the clinical value of iOCT is mainly based on whether it is helpful for surgical manipulation and whether it has influence on intraoperative decision-making. Currently, membrane peeling during vitrectomy is the most common use of iOCT. The current iOCT does not have the automatic tracking function, which requires the surgeon to stop the operation and manually adjust the position of the probe to track the scanning site to obtain the image. The synchronous automatic tracking cannot be achieved. In the future, it is necessary to develop an automatic tracking system to reduce the workload of the surgeon during the operation.
Pharmaceutical therapy, including anti-vascular endothelial growth factor treatment and intravitreal corticosteroids, is the most common treatment for branch retinal vein occlusion (BRVO) and its complications, however there are confusing ideas about the protocol, patient selection, timing and endpoint of this treatment. The disease is easy to relapse with these drugs therapy. Collateral vessel formation was found in patients receiving intravitreal injection of ranibizumab or triamcinolone for BRVO and secondary macular edema. The mechanism of collateral vessel formation has not been carefully investigated. In the past thrombolysis, arteriovenous fasciostomy and laser choroidal retinal vascular anastomosis were used to reconstruct the retinal circulation, but their rationality, effectiveness and safety need to be further were studied. In recent years, because of the key technology is still immature, the artificial vascular bypass surgery experiment is not yet practical, but provides us a new idea worth looking forward to for the treatment of BRVO.
Choroidal nevus is one of the most common benign melanocytic tumor. The prevalence rate of choroidal nevi is 0.15% - 10.00%, which is high among whites and low among colored people, and is obvious higher in male than that in female. Secondary changes in the surrounding retina of the benign tumor, such as subretinal fluid and choroidal neovascularization, may result in vision loss. This benign tumor carries risks for transformation into malignant melanoma. The factors predictive of transformation into melanoma included greater thickness, subretinal fluid, visual symptoms, orange lipofuscin pigment, tumor location (tumor margin near optic disc), ultrasonography hollowness and absence of halo. Early identification of the related features which impair visual acuity is important for early treatment and better prognosis, and it is especially important to monitor the tendency of malignant transformation. Optical coherence tomography (OCT) could provide detailed information which aid in diagnosing, differentiating and monitoring of choroidal nevi. OCT and optical coherence tomography angiography are emerging as excellent techniques to investigate choroidal melanocytic lesions. The treatment modalities, such as laser photocoagulation, photodynamic therapy and intravitreal anti-vascular endothelium growth factor, have been proved to be effective for choroidal nevi with secondary changes. In the future, the relevant researches should be imposed to provide more detailed information in order to explore the nature and characteristics of this disease.
Objective To evaluate quantification of metamorphopsia in eyes with idiopathic macular hole (IMH) before and after surgical treatment, and investigate its relationship between postoperative visual acuity, the macular hole index (MHI), and the macular hole prognostic factor (HPF). Methods Thirty eyes of 30 patients, who underwent successful vitrectomy and internal limiting membrane (ILM) peeling for IMH and were followed up more than 6 months, were included in the study. The uncorrected visual acuity of the fellow eyes was better than 20/25 and there was no metamorphopsia in that eye. The macular hole closure was confirmed by optical coherence tomography (OCT) scans. Metamorphopsia was evaluated by metamorphopsiacharts (M-chart). OCT, best corrected visual acuity (BCVA) and metamorphopsia were obtained before and after surgery. Vertical (MV) and horizontal (MH) metamorphopsia, macular hole index (MHI, the ratio of the height to the diameter of the base), and macular hole prognostic factor (HPF, the ratio of the height to the minimum diameter) were measured. The metamorphopsia score was the average value of MV and MH. SPSS 16.0 statistical analysis software was used for data analysis. Results Preoperative MV and MH were (1.82plusmn;0.04)deg;and (1.81plusmn;0.04)deg;, respectively. Six months after surgery, the MV and MH were (0.17plusmn;0.03)deg;and (0.11plusmn;0.03)deg;respectively. There was significant difference between pre- and post-operative metamorphopsia results (Z=-0.788，P＜0.05). The metamorphopsia score at 6 months after surgery were positively correlated with the value of the postoperative BCVA (LogMAR) (r=0.540,P=0.004) and negatively correlated with the values of preoperative MHI and HPF (r=-0.676, -0.518;P＜0.05). Conclusions Successful vitrectomy and ILM peeling can improve metamorphopsia of IMH. Postoperative metamorphopsia was correlated with the postoperative BCVA and the preoperative macular hole contour.
Objective To investigate the retinal toxicity and verify the safe dose of intravitreal injecting fluconazole. Methods Twelve healthy adult white rabbits were divided at random into 6 groups：a normal control group and 5 groups received intravitreal injection of a single dose of fluconazole ranging from 10 to 200 mu;g respectively.Retinal toxicity was examined by ophthalmoscopy, electroretinography, light and transmission electron microscopy (TEM) on the third and fourteenth day after injection. Results The ultrastructures of the retinal tissues of the normal control group and fluconazole 10～150 mu;g groups were normal on the third and fourteen day after injection.The light microscopy and TEM showed that cells of all the retinal layers in the 200 mu;g group revealed apparent degenerative changes on the fourteenth day after injection, and the light microscopic picture showed the vacuolar degeneration of outer segments of photoreceptors, the nuclei in outer nuclear layer drop out into inner segments, the vacuolar degeneration of nerve fiber layer, and the proliferation of pigment epithelium. TEM revealed expansion of paranucl eus space and karyopyknosis of the bipolar cells, the swelling of nerve fibers and disappearance of the synapses in the inner plexiform layer, the vacuolation and disappearance of microvilli of the pigment epithelium cells. Conclusion The safe dose of fluconazole injected intravitreally should be 100～150 mu;g. (Chin J Ocul Fundus Dis，2000，16：139-212)
Objective To evaluate metamorphopsia and vision-related quality of life (VRQoL) and its influencing factor after vitrectomy for idiopathic macular hole (IMH). Methods This is a prospective and non-randomized clinical cohort study. Thirty eyes of 30 IMH patients who received vitrectomy and inner limited membrane (ILM) peeling were included. The best-corrected visual acuity (BCVA), medical refraction test and optical coherence tomography (OCT) were performed. BCVA was recorded as logarithm of the minimum angle of resolution (logMAR). The macular hole index (MHI) was measured using OCT. The average logMAR BCVA and MHI in suffering eyes at baseline were 1.02±0.07 and 0.47±0.02, respectively. The uncorrected visual acuity of the fellow eyes was less than 0.1. Follow-up period was longer than 6 months. At 6 months after surgery, the central retinal thickness (CRT) was measured by OCT; vertical and horizontal metamorphopsia were measured by metamorphopsia charts; VRQoL was evaluated by Chinese VRQoL-25. Spearman correlation analysis was performed to analyze the relationship of VRQoL and postoperative BCVA, metamorphopsia and preoperative MHI. Results At 6 months after surgery, macular hole closure was confirmed by OCT in all patients. The vertical and horizontal metamorphopsia were (0.17±0.03)° and (0.11±0.03)°, respectively. The VRQoL-25 composite score was 79.81±1.29. The average BCVA was 0.59±0.05. The average CRT was (155.10±6.27) μm. The postoperative VRQoL was positive correlated with preoperative MHI (r=0.491,P=0.002), and negative correlated with preoperative BCVA (r=−0.445,P=0.014), postoperative BCVA (r=−0.530,P=0.003) and postoperative metamorphopsia (r=−0.532,P=0.006), but not correlated with the postoperative CRT (r=0.231,P>0.05). Conclusions IMH patients improved their visual acuity after surgery, but still have metamorphopsia. VRQoL was negative correlated with metamorphopsia, positive correlated with preoperative MHI.