Changes of Optical Coherence Tomography Parameters after Cataract Surgery in Primary Open-Angle Glaucoma Eyes
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Purpose: To investigate the impact of uncomplicated cataract surgery on the measurement of Bruch’s membrane opening-minimum rim width (BMO-MRW) and retinal nerve fiber layer thickness (RNFLT) using spectral domain optical coherencetomography (SD-OCT) in primary open-angle glaucoma (POAG) patients. Methods: This retrospective study included 63 eyes of 63 patients, including 32 POAG eyes and 31 normal eyes who underwentuneventful cataract surgery and follow-up for at least 6 months. Using SD-OCT, BMO-MRW and RNFLT were measuredpreoperatively and postoperatively at 6 months. Paired t-test was used to compare intraocular pressure (IOP), BMO-MRW,RNFLT, and image quality before and after surgery. These parameters and their changes were compared between POAG andnormal groups. Univariate and multivariate linear regression analyses were performed to determine the factors associatedwith the postoperative change (Δ) in RNFLT and BMO-MRW. Results: BMO-MRW and RNFLT were significantly increased and IOP was decreased after phacoemulsification in both groups(p < 0.001, respectively). The ΔRNFLT was significantly greater in POAG eyes compared with the normal eyes (p < 0.001). TheΔRNFLT was associated with the postoperative IOP reduction and glaucoma diagnosis (p < 0.001 and p = 0.001, respectively). In the normal group, only the ΔIOP had a significant influence on the ΔRNFLT (p = 0.003), but in the POAG group, not onlythe ΔIOP (p = 0.044) but also preoperative visual field mean deviation (p = 0.029) showed a significant influence. The ΔBMO-MRW showed no difference between POAG and normal eyes. Conclusions: The postoperative increase of RNFLT was significantly greater in the POAG group, and the postoperative increaseof RNFLT was associated with the preoperative visual field mean deviation and ΔIOP in POAG eyes and with the ΔIOPin normal eyes. Our results imply that RNFLT is more affected than BMO-MRW in POAG eyes compared to normal eyes bycataract surgery.
Abstract
Purpose: To investigate the impact of uncomplicated cataract surgery on the measurement of Bruch’s membrane opening-minimum rim width (BMO-MRW) and retinal nerve fiber layer thickness (RNFLT) using spectral domain optical coherencetomography (SD-OCT) in primary open-angle glaucoma (POAG) patients. Methods: This retrospective study included 63 eyes of 63 patients, including 32 POAG eyes and 31 normal eyes who underwentuneventful cataract surgery and follow-up for at least 6 months. Using SD-OCT, BMO-MRW and RNFLT were measuredpreoperatively and postoperatively at 6 months. Paired t-test was used to compare intraocular pressure (IOP), BMO-MRW,RNFLT, and image quality before and after surgery. These parameters and their changes were compared between POAG andnormal groups. Univariate and multivariate linear regression analyses were performed to determine the factors associatedwith the postoperative change (Δ) in RNFLT and BMO-MRW. Results: BMO-MRW and RNFLT were significantly increased and IOP was decreased after phacoemulsification in both groups(p < 0.001, respectively). The ΔRNFLT was significantly greater in POAG eyes compared with the normal eyes (p < 0.001). TheΔRNFLT was associated with the postoperative IOP reduction and glaucoma diagnosis (p < 0.001 and p = 0.001, respectively). In the normal group, only the ΔIOP had a significant influence on the ΔRNFLT (p = 0.003), but in the POAG group, not onlythe ΔIOP (p = 0.044) but also preoperative visual field mean deviation (p = 0.029) showed a significant influence. The ΔBMO-MRW showed no difference between POAG and normal eyes. Conclusions: The postoperative increase of RNFLT was significantly greater in the POAG group, and the postoperative increaseof RNFLT was associated with the preoperative visual field mean deviation and ΔIOP in POAG eyes and with the ΔIOPin normal eyes. Our results imply that RNFLT is more affected than BMO-MRW in POAG eyes compared to normal eyes bycataract surgery.
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