Light quality enhances contrast vision
Contrast vision is the ability to distinguish between different levels of luminous shades of text and images. In general, contrast sensitivity is low in dark environment and increases as the light becomes brighter and it has been known that further brightening does not improve sensitivity any further. In this study, we experimentally demonstrated that contrast sensitivity in humans can be improved by using a special lighting system that can selectively stimulate melanopsin cells in the retina.
Source: eurekalert.org