• 作者：E. Ruiz– ; De-Gopegui ; ^{erikazgz@hotmail.com} ; F.J. Ascaso ; M.A. Del Buey ; J.A. Crist&#243 ; bal
• 关键词：Biomec&aacute ; nica corneal ; Vitrectom&iacute ; a ; Cerclaje escleral ; Hist&eacute ; resis corneal
• 刊名：Archivos de la Sociedad Espa帽ola de Oftalmolog铆a
• 出版年：2011
• 期刊代码：pca66_03656691
• 类别：med
• 出版时间：November 2011
• 卷：86
• 期：11
• 页码：363-367
• 文件大小：124 K

ass="h4">Objective

To investigate the effects of encircling scleral buckle (SB) on corneal biomechanical properties of the cornea and its morphological parameters.

ass="h4">Methods

We prospectively examined twelve eyes diagnosed with vitreous haemorrhage undergoing pars plana vitrectomy (PPV), and fifteen eyes undergoing combined PPV and scleral buckle (PPV/SB) for repair of rhegmatogenous retinal detachment (RRD). Corneal biomechanical properties, including corneal hysteresis (CH) and corneal resistance factor (CRF), were measured with an Ocular Response Analyser (ORA) before and 1-month postoperatively. The ORA also determined the values of intraocular pressure (IOPg) and corneal compensated IOP (IOPcc). Finally, four morphological parameters of the cornea were measured with the Orbscan II topographer (Orbtek, Inc.): mean corneal power, thinnest corneal point (渭m), and anterior chamber depth (ACD).

ass="h4">Results

CH decreased significantly from 10.2+/-1.7 mmHg to 7.6+/-1.1 mmHg after PPV/SB (p = 0.003), but not after PPV alone (9.8+/-3.2 mmHg vs 11.6+/-2.7 mmHg, P = .465). CRF did not change significantly after surgery in both groups. IOPg and IOPcc increased significantly in the PPV/SB group (P = .019 and P = .010, respectively) but not in PPV group (P = .715 and P = .273, respectively). Unlike the PPV group, values were significantly higher than IOPg values before (P = .001) and after surgery (P = .003) in the PPV/SB group IOPcc. Neither the PPV/SB group nor the PPV group showed any significant changes in the corneal morphological parameters after surgery (P > .05).

ass="h4">Conclusions

SB surgery leads to a change in the corneal biomechanical properties without altering corneal morphological parameters. It may cause an underestimation error in IOP measurement. PPV may be a less invasive surgical approach for the repair of noncomplex RRD than PPV/SB.