How does coloured text affect accommodation?
There are two ways that the color of text impacts accommodation. The first is simply through luminance contrast. Text that has more luminance (or lightness) contrast is easier for us to focus on. For example black on white has far more contrast than yellow on white (or blue on black). Secondly, there is chromatic aberration in the eye, so if we are focused on text of one color, it is quite possible that text of another color will be out of focus and require us to accommodate again to read it.
