Dick Walton asked about the strange pattern in a Habronattus aztecanus eye, and so I’ll post another photo.
The pattern is deep inside the eye. As you look into a jumping spider eye, you normally see either black or a honey-brown colour. You see black if he/she is looking straight at you and thus you are looking straight down onto his/her retina. You see honey brown if the spider is looking off to the side, because then you are not looking into the retina, but rather to the side of the tubular eye. The big eyes of a jumping spider are not globes like ours, but rather long tubes, only the deepest bit of which is the retina.
However, in species of the Habronattus clypeatus species group, which includes species such as H. clypeatus, H. dossenus, H. californicus, and H. aztecanus, there is a part of the eye that has this strange pattern when you look down into it. It is presumably in the inner wall of the eye.