Trāṭaka (Sanskrit n.trāṭaka, tratak, trataka: "to look, or to gaze") is the practice of staring at some external object. This fixed gazing is a method of meditation which involves concentrating on a single point such as a small object, black dot or candle flame. It is used in yoga as a way of developing concentration, strengthening the eyes, and stimulating the ājňā chakra.