 Although other spiders can also jump , salticids including Portia fimbriata have significantly better vision than other spiders , : 521 and their main eyes are more acute in daylight than a cat 's and 10 times more acute than a dragonfly 's . Jumping spiders have eight eyes , the two large ones in the center @-@ and @-@ front position ( the anterior @-@ median eyes , also called " principal eyes " : 51 ) housed in tubes in the head and providing acute vision . The other six are secondary eyes , positioned along the sides of the carapace and acting mainly as movement detectors . : 16 In most jumping spiders , the middle pair of secondary eyes are very small and have no known function , but those of Portias are relatively large , and function as well as those of the other secondary eyes . : 424 : 232 The main eyes focus accurately on an object at distances from approximately 2 centimetres to infinity , : 51 and in practice can see up to about 75 centimetres . : 53 Like all jumping spiders , P. labiata can take in only a small visual field at one time , as the most acute part of a main eye can see all of a circle up to 12 millimetres wide at 20 centimetres away , or up to 18 millimetres wide at 30 centimetres away . Jumping spider 's main eyes can see from red to ultraviolet . 
