Influence of posterior capsular opacity and its removal on retinal nerve fiber layer thickness measured with spectral domain optical coherence tomography / 国际眼科杂志(Guoji Yanke Zazhi)

ABSTRACT

@#AIM:To investigate the influence of posterior capsular opacity(PCO)and its removal on retinal nerve fiber layer(RNFL)thickness measured with spectral domain optical coherence tomography(SD-OCT).<p>METHODS: Fifty patients underwent RNFL measurements using SD-OCT before and after Nd YAG laser posterior capsulotomy. The patients were divided into groups according to the value of signal to noise ratio(SNR)measured by SD-OCT as group 1 SNR 3 and 4, group 2 SNR 5 and 6 and group 3 SNR 7 and 8. The other eye served as control(control group).<p>RESULTS: The mean BCVA, SNR and RNFL measurements significantly increased in eyes underwent Nd YAG laser capsulotomy. The preoperative and postoperative mean BCVA, SNR and RNFL measurements were significantly different in group 1 and group 2. Although the preoperative and postoperative mean BCVA and SNR were significantly different, the preoperative and postoperative RNFL thickness weren't significantly different in group 3.<p>DISCUSSION: PCO has an influence on OCT image quality. SNR improved in all cases after removal of the PCO. However, RNFL thickness significantly improved after NdYAG laser capsulotomy in patients with preoperative SNR under 7.