Kollbaum Pete, Jansen Meredith, Thibos Larry, Bradley Arthur
Indiana University, School of Optometry, Bloomington, Indiana 47405, USA.
Optom Vis Sci. 2008 Sep;85(9):E817-28. doi: 10.1097/OPX.0b013e318185280e.
To evaluate the ability of a commercially available single pass Shack-Hartmann aberrometer to evaluate contact lens aberrations.
Accuracy of second-order aberration measurements was verified by measuring a series of precision calibration lenses, spectacle lenses, and contact lenses. Power measurements were compared to those expected by an independent measurement or those provided by the lens manufacturer. Accuracy of third-order aberrations was verified by systematically decentering a lens with known amounts of spherical aberration and comparing the magnitude of induced coma to that of optical theory. Fourth-order aberration accuracy was verified by comparing measured longitudinal spherical aberration values to those expected by ray tracing based on the lens design. Accuracy of lower- and higher-order aberrations was verified for measurements of lenses taken in air and within a saline-filled wet cell. Repeatability was also assessed by comparing repeated measurements of the wet cell and lens in a wet cell, before and after manipulation of that cell.
In all cases, measured values closely matched the expected values, generally exhibiting errors of <1%.
The instrument demonstrates good accuracy and repeatability in measuring second-, third-, and fourth-order aberrations of contact lenses and provides the industry with an instrument for evaluating the ex vivo optical characteristics of contact lenses.
评估一款市售单通道夏克-哈特曼像差仪评估隐形眼镜像差的能力。
通过测量一系列精密校准镜片、眼镜镜片和隐形眼镜来验证二阶像差测量的准确性。将屈光力测量值与独立测量预期值或镜片制造商提供的值进行比较。通过系统地使具有已知球差量的镜片偏心,并将诱导彗差的大小与光学理论值进行比较,来验证三阶像差的准确性。通过将测量的纵向球差值与基于镜片设计的光线追迹预期值进行比较,来验证四阶像差的准确性。对于在空气中和充满盐水的湿盒内的镜片测量,验证了低阶和高阶像差的准确性。还通过比较在湿盒中对湿盒和镜片进行操作前后的重复测量来评估重复性。
在所有情况下,测量值与预期值紧密匹配,通常误差<1%。
该仪器在测量隐形眼镜的二阶、三阶和四阶像差方面显示出良好的准确性和重复性,并为该行业提供了一种评估隐形眼镜离体光学特性的仪器。