Chromatic Aberration

All OKULIX-calculations are normally performed monochromatically at 540nm. The influence of chromatic aberration on subjectiv visual impression can be simulated by selection of a white spectrum (sun or bulb). The effect is relatively small. Therefore, the Landolt’s ring should be already as sharp as possible. This can be achieved e.g. by the procedure as described in the previous subsection. In addition the contrast may be calculated for better objectivation. In reality, visual impression also depends on the spectral sensitivity of the retina which is different for scotopic and photopic conditions. As an alternative, also the spectral sensitivity of a commercial CCD- camera can be selected being more sensitive in the red. Selection of additional glasses in the order of 0.1 diopters helps to demonstrate the defocuss caused by chromatic aberration.