Vision is an ideal sensor modality for intelligent robots. It provides rich information on the environment as required for recognizing objects and understanding situations in real time. Moreover, vision-guided robots may be largely calibration-free, which is a great practical advantage. Three vision-guided robots and their design concepts are introduced: an autonomous indoor vehicle, a calibrationfree manipulator arm, and a humanoid service robot with an omnidirectional wheel base and two arms. Results obtained, and insights gained, in real-world experiments with them are presented.