They evolved that way to enable them to see.
Most spiders have four pairs of eyes on the top-front area of the cephalothorax, arranged in various different patterns depending on the type of spider.
The pair at the front are called pigment-cup ocelli or “little eyes”, which in most spiders are only capable of detecting the direction from which light is coming. However the main eyes at the front of spiders’ heads are pigment-cup ocelli that are capable of forming images. With the exception of the jumping spider, which has acute, excellent vision, the spider does not have very good vision despite the number of eyes they have.
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