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Dr. Bigbulls
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It is well known that spiders have multiple eyes, but not all species are the same. In fact, the number of eyes range from eight to zero, most common spiders have only 6, while some cave dwelling species have no eyes at all.
Several families of hunting spiders, such as jumping spiders and wolf spiders, have fair to excellent vision. The main pair of eyes in jumping spiders even see in color. Net-casting spiders have enormous, compound lenses that give a wide field of view and gather available light very efficiently. However, most spiders that lurk on flowers, webs, and other fixed locations waiting for prey tend to have very poor eyesight; instead they possess an extreme sensitivity to vibrations, which aids in prey capture. Vibration sensitive spiders can sense vibrations from such various mediums as the water surface, the soil or their silk threads. Also changes in the air pressure can be detected in the search for prey.
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