Trāṭaka is attention made visible: the practice of resting the gaze on a single small object, classically a candle flame, without blinking, until the eyes water. The Haṭha Yoga Pradīpikā lists it among the six cleansing acts (ṣaṭkarma), and its instruction is a single sentence: gaze with a steady mind at a small mark until the tears come. The tears, in the tradition’s reading, are the point, the eye’s own washing. The deeper cleansing is of the restless attention behind the eye.
The practice
Set a candle at arm’s length, the flame at eye level or slightly below, in a dim and draftless room. A black dot on paper serves equally well and is gentler on the eyes.
Sit steadily. Let the gaze settle on the brightest part of the flame, soft, not a stare of effort. When the eyes water or tire, close them, and hold the after-image of the flame at the point between the brows until it fades. That is one round. Two or three rounds, five to ten minutes in all, is a full practice.
The mind will leave a hundred times. The practice is not “not leaving.” It is the hundredth quiet return.
What it trains
Of the five trainings, this is the purest cultivation of attention: one continuous object, one continuous returning. Where breath practices give the mind a rhythm to ride, trāṭaka gives it a single unmoving anchor, which is harder and correspondingly stronger medicine for a scattered age. The after-image phase adds a second skill, holding an inner object, the first step toward visualization practices across many traditions.
The modern evidence is early, small trials reporting improved attention and working memory, and this library labels it accordingly: promising, under-studied, and cheap to test on yourself.
Cautions
Never gaze at the sun or any painful light. Stop if the eyes sting beyond gentle watering. People with glaucoma or eye conditions should use the closed-eye or paper-dot form and a clinician’s counsel. Those prone to photosensitive discomfort should prefer the black-dot form over a flickering flame.