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en.wikipedia.org/wiki/Spider

Spiders (order Araneae) are air-breathing arthropods that have eight legs and chelicerae with ... In all except the most primitive group, the Mesothelae, spiders have the most ... as arachnids do not have the mandibles that crustaceans and insects have. .... However, in spiders these eyes are capable of forming images.

en.wikipedia.org/wiki/Spider_anatomy

Spiders have up to eight eyes, each with a single lens rather ... the rest, or even, in some cave species, there are no eyes at all. ... the eyes, and since arachnid eyes do not have irises, it is rapidly ...

www.livescience.com/24054-why-spiders-have-eight-eyes.html

Oct 17, 2012 ... Spiders need their secondary eyes to dodge when something comes their way. ... The jumping spider Phidippus audex, like most spiders, sports 8 eyes. ... Either way, new research suggests all those extra pairs of spider peepers have ... than trapping it in webs, have four pairs of eyes (as do most spiders).

annemaclachlan.wordpress.com/2010/05/30/why-do-spiders-have-eight-eyes

May 30, 2010 ... Apparently not all arachnids actually have eight eyes. Spiders who have eight of them use them all, yet they still don't see as well as do those of ...

scienceline.ucsb.edu/getkey.php?key=3238

You're right, most spiders do have eight eyes - but not all of them! Some spiders have two eyes while others have four or six. There are over 34,000 species of ...

www.quora.com/Why-do-spiders-have-eight-eyes

The complete eye toolkit for a spider is shown above. The maximum possible is four pairs of ... You can have spiders with six eyes, with four, or even no eyes at all. As for function, the principal eyes have the largest lenses and are used for the  ...

www.spiders.us/faq/how-many-eyes-do-spiders-have

Most spiders possess eight (yes, 8!) eyes, though the majority cannot see very well ... and those which live their entire lives in the soil, may have no eyes at all.

infinitespider.com/many-eyes-spider

Oct 28, 2014 ... Spiders usually have eight or fewer eyes (some have six or less). ... large lens in one eye doesn't restrict resolution like a compound eye does.

news.nationalgeographic.com/news/2004/06/0623_040623_spiderfacts_2.html

Most spiders have eight eyes. ... However they're equipped to see, all spiders have highly evolved systems to detect prey and danger. ... All too often, a smack with a newspaper. ... If the bite becomes infected or does not heal, see a physician.