【摘要】 角膜曲率半径、屈光度和散光轴位是评价人眼角膜形态的关键参数。为解决人眼角膜参数准确测量和量值有效溯源,基于角膜反射成像原理,采用球面和环曲面设计形式,首次研制出人眼角膜参数系列标准。曲率半径测量范围为(5.5～10.0) mm,不确定度U=0.002 mm(k=2);轴位测量范围为0°～180°,不确定度U=1°(k=2)。建立了角膜曲率计工作基准装置国家计量标准,形成了人眼角膜参数量值传递与溯源体系。实验结果表明,该计量标准可以满足人眼角膜参数测量仪器的校准和量值溯源,保证人眼角膜参数的测量准确。更多还原

【Abstract】 Corneal curvature radius,corneal refractive power and astigmatic axis are key parameters for evaluation of human corneal topography. In order to accurately measure and trace the human cornea parameters,based on the principle of human corneal reflection imaging,a series of standards for human corneal parameters were developed for the first time in the form of spherical and toroidal surface design. For curvature radius the measurement range is (5. 5 ～ 10. 0) mm and uncertainty is 0. 002 mm (k = 2). While for axis the measurement range is (0° ～ 180°) and uncertainty is 1° (k = 2).Moreover,national standard for ophthalmometers has been established and traceability system for corneal parameters has been formed. Experimental results showed that the measurement standard and traceability system can meet the requirements of calibration and traceability of human corneal parameter instrument,and guarantee the accuracy of corneal parameter measurement.更多还原