Howarth P A, Bradley A
Vision Res. 1986;26(2):361-6. doi: 10.1016/0042-6989(86)90034-9.
The human eye suffers from longitudinal chromatic aberration, and this has been thought to average approximately 1.75 D between 420 and 660 nm. In many vision experiments the aberration may be a serious problem, and a number of lenses have been designed to correct it, two of which have recently been commercially available. These achromatising lenses produce an equal but opposite aberration to that of the average eye, and the power of the eye/lens combination should then be independent of wavelength. Recent measures of the eye's longitudinal aberration suggest that the average may be substantially greater than the above value, in which case lenses based on this figure should be inadequate. Using a Badal optometer we determined the far points for 20 subjects with each of the recent lenses, and without either, at nine wavelengths over the above range. Consistent with the early studies we found an average aberration of 1.82 D (SD 0.15 D). Both lenses performed as specified, and none of our subjects had over 0.48 D of residual aberration when corrected with either.
人眼存在纵向色差，据认为在420至660纳米之间其平均值约为1.75屈光度。在许多视觉实验中，这种色差可能是个严重问题，并且已经设计了多种透镜来校正它，其中有两种最近已投入商业使用。这些消色差透镜产生的色差与普通眼睛的色差大小相等但方向相反，这样眼睛/透镜组合的屈光力就应与波长无关。最近对眼睛纵向色差的测量表明，平均值可能大大高于上述数值，在这种情况下，基于该数值设计的透镜可能并不适用。我们使用一台巴达尔验光仪，在上述波长范围内的九个波长下，分别为20名受试者测定了使用每种最新透镜以及不使用任何透镜时的远点。与早期研究一致，我们发现平均色差为1.82屈光度（标准差0.15屈光度）。两种透镜的表现均符合规格，并且在用任何一种透镜校正后，我们的受试者中没有一人的残余色差超过0.48屈光度。
