<sod>Box jellyfish have complex visual systems and each of the four rhopalia on the bell of ''Tripedalia cystophora'' consists of a group of six eyes of four morphological types. The uppermost and the lowest eye each contains a lens, and there are also a pair of slit eyes and a pair of pit eyes. It has been found that ''Tripedalia cystophora'' displays complex behaviours such as the avoidance of obstacles and fast swimming in a particular direction and is able to maintain its position in the shaft of sunlit water presumably by using visual cues. The presence or absence of the copepod prey or the quantity present does not seem to affect its turning behaviour or swimming speed but by remaining in the sunlit water it maximises the number of copepods on which it can feed.<ref name=Buskey/> It can detect a cylindrical object such as a root when it gets close enough to it and can then swerve sharply to one side to avoid it.<ref name=Garm2/><eod>
<sod>Box jellyfish have complex visual systems and each of the four [[rhopalia]] on the bell of ''Tripedalia cystophora'' consists of a group of six eyes of four morphological types. The uppermost and the lowest eye each contains a lens, and there are also a pair of slit eyes and a pair of pit eyes. It has been found that ''Tripedalia cystophora'' displays complex behaviours such as the avoidance of obstacles and fast swimming in a particular direction and is able to maintain its position in the shaft of sunlit water presumably by using visual cues. The presence or absence of the copepod prey or the quantity present does not seem to affect its turning behaviour or swimming speed but by remaining in the sunlit water it maximises the number of copepods on which it can feed.<ref name=Buskey/> It can detect a cylindrical object such as a root when it gets close enough to it and can then swerve sharply to one side to avoid it.<ref name=Garm2/><eod>