方法：回顾性分析。收集2014-01/2014-12在马来西亚吉打州，亚罗士打Sultanah Bahiyah医院收治的PDR行玻璃体切除术病例资料，包括1y内患者统计，基线视力(VA)和LogMAR术后最佳矫正视力。使用IBM SPSS Statistics Version 22.0进行数据分析。

结果：共103例患者。平均年龄51.2y。在多变量分析中，每个0 logMAR基线VA的1 logMAR术前正偏差与0.859 logMAR的术后改善相关(P<0.001)。同样，术前附着的黄斑与玻璃体切除术后的logMAR视力改善相关(b=0.374，P=0.003)。无虹膜新血管和无术后并发症与玻璃体切除术后改善的logMAR视力相关，分别为1.126(P=0.001)和0.377(P=0.005)。无长效眼内填充与玻璃体切除术后logMAR视力改善相关，为0.302(P=0.010)。

结论：玻璃体切除术后与视力改善的相关因素是：术前视力较差，黄斑附着，无虹膜新生血管，无术后并发症和未使用长效眼内填充物。了解视力改善的因素将有助于玻璃体视网膜手术的决策。

METHODS: This was a retrospective analysis of pars plana vitrectomy indicated for sequelae of PDR from Jan. to Dec. 2014 in Hospital Sultanah Bahiyah, Alor Star, Kedah, Malaysia. Data collected included patient demographics, baseline visual acuity(VA)and post-operative logMAR best corrected VA at 1y. Data analysis was performed with IBM SPSS Statistics Version 22.0.

RESULTS: A total of 103 patients were included. The mean age was 51.2y. On multivariable analysis, each pre-operative positive deviation of 1 logMAR from a baseline VA of 0 logMAR was associated with a post-operative improvement of 0.859 logMAR(P<0.001). Likewise, an attached macula pre-operatively was associated with a 0.374(P=0.003)logMAR improvement post vitrectomy. Absence of iris neovascularisation and absence of post-operative complications were associated with a post vitrectomy improvement in logMAR by 1.126(P=0.001)and 0.377(P=0.005)respectively. Absence of long-acting intraocular tamponade was associated with a 0.302(P=0.010)improvement of logMAR post vitrectomy.

CONCLUSION: Factors associated with visual improvement after vitrectomy are poor pre-operative VA, an attached macula, absence of iris neovascularisation, absence of post-operative complications and abstaining from use of long-acting intraocular tamponade. A thorough understanding of the factors predicting visual improvement will facilitate decision-making in vitreoretinal surgery.