目的：分析角膜后前表面曲率半径比值(B/F比值)与年龄相关性白内障患者术后屈光误差的关系，探讨B/F比值对人工晶状体(intraocular lens,IOL)度数计算精确性的影响。方法：选取2019年3—11月在天津医科大学眼科医院白内障中心就诊，并拟行单眼白内障手术的年龄相关性白内障患者共197例(197眼)，术前应用Pentacam眼前节分析仪测量患者眼前节生物参数，并以B/F比值下限25%、上限25%为界将患者分为下25%组、25%～75%组、上25%组。术后3个月应用全自动电脑验光仪评估患者术后屈光状态，并计算患者术后屈光误差(postoperative refractive error,PE)，比较三组平均屈光误差(mean refractive error,ME)、平均绝对误差(mean absolute error,MAE)、中位数绝对误差(median absolute error,MedAE)以及屈光误差在±0.25、±0.50、±0.75、±1.00、>±1.00 D范围内百分比差异。结果：B/F比值与年龄相关性白内障患者术后屈光误差呈中度相关(r=?0.445, P<0.001)。随着B/F比值增大，患者术后屈光状态由远视向近视漂移，术后3个月MAE、MedAE分别为0.55 D、0.46 D。屈光误差在±0.25、±0.50、±0.75、±1.00、>±1.00 D范围的百分比分别为29.4%、52.8%、71.6%、87.6%、12.7%。根据正常年龄相关性白内障人群B/F比值优化得到的矫正角膜折射指数计算角膜曲率后，MAE、MedAE分别为0.51、0.43 D，均低于矫正前(P<0.05)。结论：B/F比值对年龄相关性白内障患者术后屈光状态有影响。随着B/F比值的增加，白内障患者术后屈光状态由远视逐渐向近视漂移，且B/F比值越偏离正常平均值，患者的屈光误差绝对值越大。

Objective: To analyze the relationship between corneal B/F ratio and postoperative refractive error in age-related cataract patients, and to explore the impact of B/F ratio on the accuracy of intraocular lens power calculation. Methods: A total of 197 age-related cataract patients (197 eyes) who were treated in the cataract center of our hospital from March 2019 to November 2019 and were going to undergo monocular cataract surgery were selected. The biological parameters of the anterior segment were measured by Pentacam anterior segment analyzer before surgery, and the patients were divided into three groups (25% below the B/F ratio, 25%~75%, and 25% below the B/F ratio) with the lower limit and the upper limit of 25%. Three months after surgery, the postoperative refractive state of patients was evaluated by automatic computerized refractometer, and the postoperative refractive error (PE) was calculated, and the percentage differences of mean refractive error (ME), mean absolute error (MAE), median absolute error (MedAE) and refractive error in the range of ±0.25, ±0.50, ±0.75, ±1.00 and < ±1.00D were evaluated. Results: The B/F ratio was moderately correlated with postoperative refractive error in age-related cataract patients (r= ?0.445, P < 0.001). With the increase of B/F ratio, the refractive state of patients shifted from hyperopia to myopia after surgery, and the MAE and MedAE were 0.55 D and 0.46 D respectively in 3 months after surgery. The percentages of refractive error in the range of ±0.25, ±0.50, ±0.75, ±1.00 and < ±1.00 D were 29.4%, 52.8%, 71.6%, 87.6% and 12.7%, respectively. After adjusting the corneal curvature according to the B/F ratio of the population based on our previous study, MAE and MedAE were 0.51 D and 0.43 D, respectively, which were lower than those before correction (P< 0.05). Conclusions: There is a correlation between B/F ratio and postoperative refractive error in age-related cataract patients. As the B/F ratio increased, the refractive state of the patient gradually drifted from farsightedness to myopia after cataract surgery, and the more the B/F ratio deviated from the normal average, the greater the absolute value of the patient's refractive error.

目的：总结并分析视野为中心暗点的视神经病变的病因和临床特点，为临床诊治提供参考。方法：回顾性病例研究。分析2018年8月至2020年3月期间，在中山大学中山眼科中心神经眼科专科门诊就诊，视野表现为中心暗点且随访1年以上的视神经病变患者的资料。患者双眼均行最佳矫正视力、眼压、裂隙灯显微镜及前置镜、频域光学相干断层扫描、视野、颅脑和眼眶核磁共振检查，静脉采血行血常规、血生化、肝肾功能、感染指标(乙肝、丙肝、梅毒、HIV及结核T-spot)检查及Leber遗传性视神经病变的线粒体DNA和OPA1基因检测。结果：共纳入20例患者，病因诊断构成为：Leber遗传性视神经病变9例(45%)，显性视神经萎缩2例(10%)，乙胺丁醇中毒性视神经病变6例(30%)，营养性视神经病变2例(10%)和特发性脱髓鞘性视神经病变1例(5%)。遗传性视神经病变的视力预后差，特别是Leber遗传性视神经病变，78%的随访视力(≥1年)不高于0.1。伴有mtDNA或OPA1基因突变的乙胺丁醇中毒性视神经病变患者，视力预后差。结论：视野为中心暗点表现的视神经病变，主要为遗传、中毒和营养性视神经病变。遗传性视神经病变具有不完全外显率的特点，视野为中心暗点的视神经病变需行基因检测排除遗传性视神经病变。

Objective: To summarize and analyze the etiology and clinical features of optic neuropathy with visual field defect of central scotoma as a reference for clinical diagnosis and treatment. Methods: In the retrospective case study, the data of patients admitted in Neuro-ophthalmic Department of Zhongshan Ophthalmic Center of Sun Yat-sen University from August 2018 to March 2020, who presented with visual field defect of central scotoma and were followed up for more than 1 year, were analyzed. Both eyes of all the patients underwent best corrected visual acuity, intraocular pressure, slit lamp microscope and front mirror, spectral domain optical coherence tomography, humphry visual field tests and MRI of brain and orbit. We examined the blood routine, biochemical test, renal and liver function, infection indicators (hepatitis B, hepatitis C, syphilis, HIV and tuberculosis T-spot), mitochondrial DNA and OPA1 gene detection of Leber hereditary optic neuropathy. The follow-up time of the patients in neuro-ophthalmic department was more than 1 year. Results: A total of 20 patients were recruited. Among them, the etiological diagnosis consisted of 9 patients of Leber hereditary optic neuropathy (45%), 2 of dominant optic atrophy (10%), 6 of ethambutol-induced optic neuropathy (30%), 2 of nutritional optic neuropathy (10%) and 1 of idiopathic demyelinating optic neuropathy (5%). The patients with hereditary optic neuropathy showed a poorer visual prognosis, especially Leber hereditary optic neuropathy, with 78% of follow-up visual acuity (≥1 year) not higher than 0.1. The visual prognosis of ethambutol-induced optic neuropathy patients with mtDNA or OPA1 gene was poor. Conclusions: The optic neuropathy of visual field defects with central scotoma includes mainly hereditary, toxic and nutritional optic neuropathy. Hereditary optic neuropathy is characterized by incomplete penetrance, and genetic testing is required to exclude hereditary optic neuropathy if the visual field is the central scotoma.