目的　探讨复杂性视网膜脱离经玻璃体和视网膜手术后 ,低眼压的发生率和危险因素。方法　对 142例复杂性视网膜脱离行玻璃体视网膜手术的临床资料进行回顾性分析 ,低眼压的诊断标准为眼压≤ 5mmHg (1mmHg=0 133kPa) ,并持续 6个月。结果　 142例中 ,术后 1年低眼压发生率为 11 3% ,其中外伤性视网膜脱离和孔源性视网膜脱离术后低眼压的发生率分别为 18 9%及6 7% ,两组比较差异有显著性 (χ2 =4 89,P <0 0 5 )。无晶状体眼和有晶状体眼术后低眼压的发生率分别为 2 0 9%及 7 0 % ,两组比较差异有显著性 (χ2 =5 6 7,P <0 0 5 )。增殖性玻璃体视网膜病变C级和D级术后低眼压的发生率分别为 1 8%和 15 1% ,两组比较差异有显著性 (χ2 =3 97,P <0 0 5 )。术前有低眼压者和无低眼压者术后低眼压的发生率分别为 2 1 9%和 6 9% ,两组比较差异有显著性(χ2 =5 16 ,P <0 0 5 )。结论　低眼压是复杂性视网膜脱离手术后的一个并发症 ,眼外伤、无晶状体眼、术前低眼压及严重的增殖性玻璃体视网膜病变是发生低眼压的危险因素。 Objective To investigate the incidence and risk factors of hypotension after complicated vitreoretinal surgery and retinal surgery. Methods The clinical data of 142 cases with complicated retinal detachment underwent vitreoretinal surgery were retrospectively analyzed. The diagnostic criteria for hypotensive intraocular pressure were intraocular pressure ≤ 5mmHg (1mmHg = 0,133kPa) for 6 months. Results Among the 142 cases, the incidence of hypotension at 1 year after operation was 113%. The incidences of postoperative IOP in traumatic and rhegmatogenous retinal detachment were 18 9% and 67%, respectively. Two groups The difference was significant (χ2 = 4 89, P <0 05). The incidence of postoperative low intraocular pressure (IOP) in aphakia and phakic was 29.0% and 70.0%, respectively. There was significant difference between the two groups (χ2 = 56.7, P <0.05). The incidence of postoperative low intraocular pressure in proliferative vitreoretinopathy grade C and D were 18% and 15 1%, respectively. There was significant difference between the two groups (χ2 = 3 97, P <0 05). The preoperative low intraocular pressure and no low intraocular pressure were postoperative low intraocular pressure were 21.9% and 69%, the difference between the two groups was significant (χ2 = 5 16, P <0 05 ). Conclusions IOP is a complication of complex retinal detachment surgery. Ocular trauma, aphakia, preoperative hypotension and severe proliferative vitreoretinopathy are risk factors for hypotensive hypotension.