<qa>  What is the focal characteristics of the accommodative response affected by longitudinal chromaticC. Longitudinal Chromatic Aberration. The focal characteristics of the accommodative response also are affected by longitudinal chromatic aberration Kruger et al., 1995; Lee et al., 1999; Stark et al., 2002; Rucker Kruger, 2004; Rucker Kruger 2006. When the LM-cone contrast ratio of a stimulus is high, the mean accommodation level decreases, biasing the response towards far; S-cone stimulus contrast biases the response towards near Stark et al., 2002; Rucker Kruger, 2004. A low-pass filter reduces accommodation demand by 0.50 D Kroger Binder, 2000, and reading performance tends to be better with blue transmitting filters Solman, Cho, Dain, 1991; Williams, Lecluyse, Rock-Fauchex, 1992; Solan, 1998; Iovino et al., 1998; Edwards Hogben, 1999; Ray, Fowler, Stein, 2005, whereas diffuse red light impairs reading Chase et al., 2003. 