Here's an interesting info that might like..
"Since the lenses of these eyes are relatively fixed, the internal eye muscles serve to move the retina. Because the retina is the darkest part of the eye and it moves around, one can sometimes look into the eye of a jumping spider and see it changing color. When it is darkest, you are looking into its retina and the spider is looking straight at you."
Source:http://pestid.msu.edu/InsectsArthropods/JumpingspiderFamilySalticidae/tabid/267/Default.aspx
Very nice catch!
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