Variance-covariance matrix of the biometric measure uncertainties to be used for an advanced error propagation model. The variances are shown (in bold) on the diagonal, and the covariances are shown in the off-diagonal elements. All values are scaled by x1000. CCT, ACD, LT and WTW refer to the central corneal thickness, anterior chamber depth, central thickness of the crystalline lens, axial length, and horizontal corneal diameter respectively. K1, K2, K_AST, K_EQ, K_C0 and K_C45 refer to the keratometric powers in the flat and steep corneal meridians, the corneal astigmatism, and to the 3 keratometric power vector components with the equivalent power K_EQ and the 2 astigmatic components as projections of the astigmatism to the 0°/45° meridian K_C0 and the 45°/135° meridian K_C45.

Variance-covariance matrix of the biometric measure uncertainties to be used for an advanced error propagation model. The variances are shown (in bold) on the diagonal, and the covariances are shown in the off-diagonal elements. All values are scaled by x1000. CCT, ACD, LT and WTW refer to the central corneal thickness, anterior chamber depth, central thickness of the crystalline lens, axial length, and horizontal corneal diameter respectively. K1, K2, KAST, KEQ, KC0 and KC45 refer to the keratometric powers in the flat and steep corneal meridians, the corneal astigmatism, and to the 3 keratometric power vector components with the equivalent power KEQ and the 2 astigmatic components as projections of the astigmatism to the 0°/45° meridian KC0 and the 45°/135° meridian KC45.本数据集为用于高级误差传播模型 (error propagation model) 的生物测量不确定性的方差-协方差矩阵 (variance-covariance matrix)，其对角线上以粗体标注方差，非对角线元素标注协方差。所有数值均按1000倍比例进行缩放。其中，CCT、ACD、LT、WTW分别指代中央角膜厚度 (central corneal thickness)、前房深度 (anterior chamber depth)、晶状体中央厚度 (central thickness of the crystalline lens)、眼轴长度 (axial length) 以及水平角膜直径 (horizontal corneal diameter)；K1、K2、KAST、KEQ、KC0及KC45分别指代平坦与陡峭角膜子午线的角膜曲率计屈光力、角膜散光，以及3个角膜屈光力矢量分量，其中等效屈光力为KEQ，另外两个散光分量分别为将散光投影至0°/45°子午线的KC0，以及投影至45°/135°子午线的KC45。