According to Kinast, the "up close" or "near work" component may be due to the accommodation process our eyes go through when we look at something up close and what it requires of the eye's lens.

This article was originally published with the title “Refraction and Accommodation in the Dog's Eye:—A Correction” inSA Supplements Vol. 81 No. 2109supp(June 1916), p. 357doi:10.1038 ...