AIM： To assess the refractive status, anterior chamber depth （ACD） and axial length （AL） of patients with primary angle-closure disease （PACD）. METHODS： Retrospective cohort. Data was collected from charts of...AIM： To assess the refractive status, anterior chamber depth （ACD） and axial length （AL） of patients with primary angle-closure disease （PACD）. METHODS： Retrospective cohort. Data was collected from charts of all PACD patients treated from April 2013 to December 2015. Analysis was done on 137 patient charts with complete biometric data. Patient demographics, PACD type, refractive status （spherical equivalent）, ACD and AL were studied. RESULTS： The median age of 137 subjects [53 with primary angle-closure suspects （PACS）, 27 with primary angle- closure （PAC） and 57 with primary angle-closure glaucoma （PACG）] was 68y （range 21-88y）. The majority was Chinese （n=68; 49.6%） and most of them were women （n=75; 54.7%）. The distribution of myopia （n=51; 37.2%） and hyperopia （n=49; 35.8%） was similar. The ACD was shallower in myopes compared to hyperopes （P=-0.02） and emmetropia （P=-0.049） but the AL was not significantly different between groups. There were no patients blind from PACG. CONCLUSION： Both myopia and hyperopia can occur in PACD. Despite a shallower ACD in angle closure myopes, the AL was not different between groups.展开更多
K2DPCA(Kernel-based 2D Principal Component Analysis)能够刻画图像的非线性特征,同时保留原始图像的二维数据结构和邻域信息,在人脸识别领域具有成功的运用,但其对异常值比较敏感。为克服此问题,将“角度”的概念引入非线性空间,基...K2DPCA(Kernel-based 2D Principal Component Analysis)能够刻画图像的非线性特征,同时保留原始图像的二维数据结构和邻域信息,在人脸识别领域具有成功的运用,但其对异常值比较敏感。为克服此问题,将“角度”的概念引入非线性空间,基于核方法提出Sin-K2DPCA,并采用F范数度量,将样本数据经非线性映射到高维空间后极小化相对重构误差。为进一步解决非线性的核矩阵规模较大、计算复杂度高的问题,利用Cholesky分解方法,计算大规模核矩阵K的低秩近似,提出了基于Cholesky分解的Chol+SinK2DPCA。实验结果表明,在ORL、Yale人脸数据库中,Chol+SinK2DPCA提高了识别率,并克服噪声的影响;在大规模数据集Extended YaleB中,Chol+SinK2DPCA有效解决了K2DPCA由于核矩阵规模过大而不能实现的问题。展开更多
文摘AIM： To assess the refractive status, anterior chamber depth （ACD） and axial length （AL） of patients with primary angle-closure disease （PACD）. METHODS： Retrospective cohort. Data was collected from charts of all PACD patients treated from April 2013 to December 2015. Analysis was done on 137 patient charts with complete biometric data. Patient demographics, PACD type, refractive status （spherical equivalent）, ACD and AL were studied. RESULTS： The median age of 137 subjects [53 with primary angle-closure suspects （PACS）, 27 with primary angle- closure （PAC） and 57 with primary angle-closure glaucoma （PACG）] was 68y （range 21-88y）. The majority was Chinese （n=68; 49.6%） and most of them were women （n=75; 54.7%）. The distribution of myopia （n=51; 37.2%） and hyperopia （n=49; 35.8%） was similar. The ACD was shallower in myopes compared to hyperopes （P=-0.02） and emmetropia （P=-0.049） but the AL was not significantly different between groups. There were no patients blind from PACG. CONCLUSION： Both myopia and hyperopia can occur in PACD. Despite a shallower ACD in angle closure myopes, the AL was not different between groups.
