Trataka is the Hatha-yoga practice of fixed gazing at a small external object until tears flow. The standard object is a candle flame at arm’s length, eye level, on a dark background. The Hatha Yoga Pradipika 2.31 to 2.32 describes the technique and lists it as one of the six cleansing kriyas (ṣaṭkarmas). A session typically runs 5 to 20 minutes, in a darkened room, with the practitioner seated upright. The two forms of the practice are bahiranga trāṭaka (external gazing) and antaranga trāṭaka (internal visualisation, with the eyes closed).
The classical verses
Hatha Yoga Pradipika 2.31 reads: “nirīkṣen niścala-dṛśā sūkṣma-lakṣyaṃ samāhitaḥ / aśru-saṃpāta-paryantam ācāryais trāṭakaṃ smṛtam” — “Gaze with motionless eyes at a small object with focused mind until tears arise. This is called Trataka by teachers.” Verse 2.32 follows: “Trataka removes diseases of the eye, exhaustion and sloth, and closes the door to these afflictions.” The verse pairs the cleansing function (removing physical fatigue from the eye muscles) with the meditative function (closing the door to mental sloth).
The text places Trataka in chapter 2 alongside the other five cleansing kriyas: dhauti (cleansing the digestive tract), basti (colon irrigation), neti (nasal irrigation), nauli (abdominal massage), and kapalabhati (forceful exhalation). Each kriya is presented as preparatory; once the body is purified, the practitioner moves to pranayama, mudra and meditation.
The technique step by step
- Setup: a darkened room, a candle placed on a small stand at arm’s length, the flame at eye level. The candle wick should be the only visible point of light.
- Posture: sit cross-legged on a folded blanket, spine upright, shoulders relaxed. Hands rest in chin mudra on the knees.
- Initial settle: 5 to 10 slow nasal breaths. Close the eyes and feel the body still.
- Begin gazing: open the eyes and look at the wick (the brightest point of the flame, just above the top of the wick). The gaze is soft but stationary.
- Hold: avoid blinking as long as comfortable. The eyes will water; this is the cleansing the text refers to. Continue until tears actually flow.
- Close the eyes: when tears flow or strain becomes uncomfortable, close the eyes. Hold the after-image of the flame at the eyebrow centre for as long as it persists, often 30 seconds to a minute.
- Repeat: when the after-image fades, open the eyes and gaze again. Three to five rounds make a full session.
- End: close the eyes, cup the palms over them, breathe slowly. Sit for a few minutes before standing.
External and internal forms
The external form (bahiranga) is the candle-gazing described above. The internal form (antaranga) is the visualisation of the same flame at the eyebrow centre with the eyes closed. The two are practiced as a single sequence: external first, then internal as the after-image phase. After several months of practice the internal form can be sustained without the preceding external gazing; the visualised flame becomes stable on its own.
Other objects can substitute for the candle: a yantra, a small black dot on a white card, an OM symbol, a star in the night sky, a deity image, a personal symbol. The Hatha Yoga Pradipika specifies a small object (sūkṣma-lakṣya) at distance, not a candle specifically. The candle became the modern default because it provides a small, bright, fixed point with a strong after-image.
Documented effects
- Concentration: sustained-attention tasks show improvement after 4 to 8 weeks of daily Trataka in published studies on student populations.
- Ocular health: the tearing flushes the cornea and tear ducts. The classical claim that the practice removes “diseases of the eye” is more accurately stated as: regular Trataka reduces dry-eye symptoms and refreshes tear-film stability. It does not cure refractive errors.
- Sleep onset: reduced sleep latency in mild insomnia subjects when practiced in the evening.
- Anxiety scores: modest reductions in standardised anxiety inventories after 6 to 8 weeks.
Where Trataka sits in the broader practice
The Hatha Yoga Pradipika treats Trataka as preparation. In the eight-limb scheme of Patanjali, Trataka maps roughly onto dharana, the sixth limb (concentration). The practice trains the capacity that meditation then uses; the eye is the easier-to-train proxy for the wandering mind. When the eye stays on a candle, the mind tends to stay on its object as well. The Yoga Sutras themselves do not name Trataka, but the dharana technique of 3.1 (binding the mind to one place) describes the same operation.
A practical observation
For what it’s worth, the candle flame is forgiving in a way that other objects are not. The slight motion of the flame (which Trataka practitioners learn to ignore) gives the eye something to fix against, and the after-image after closing the eyes is reliably bright for 30 to 60 seconds. A static object like a black dot produces a much fainter after-image and is correspondingly harder to use for the antaranga phase. New practitioners often start with a yantra or dot, struggle to hold the internal image, and conclude the practice is not working; switching to a candle usually resolves the difficulty.
Common questions
Is staring at a candle safe for the eyes?
For most practitioners, yes. A candle flame produces well below the threshold of light that damages the retina (a candle is around 12 lux at arm’s length; sunlight is 100,000 lux). The tearing is a protective and cleansing response, not a sign of damage. People with photosensitive epilepsy, glaucoma, or recent eye surgery should consult an ophthalmologist before beginning.
How long until the practice “works”?
Subjective effects on concentration are usually noticeable in the first 2 to 3 weeks of daily 10-minute practice. The cleansing effect on the eye muscles (less eye-fatigue, less squinting at the end of a long screen day) tends to show up faster, often within the first week. The deeper concentration effect that Patanjali calls dharana takes several months of regular practice.
Can it be done with a screen instead of a candle?
The classical instruction assumes a real flame. A still image on a screen would technically work as a fixed point, but the flicker rate of most screens (typically 60 to 144 Hz) and the back-light intensity make it a poorer object than a candle. A digital candle app is not equivalent. If a real flame is impractical, a small dot drawn on paper at arm’s length is closer to the source text than a screen.
One limitation worth noting
Claims that Trataka develops psychic powers (telepathy, clairvoyance, the ability to influence others through a gaze) are extrapolations from later siddhi-focused traditions rather than from the Hatha Yoga Pradipika itself. The source verse describes concentration and the removal of eye-fatigue and mental sloth, not the development of supernatural abilities. The practice is genuinely useful for attention training; the larger claims are tradition-specific and not text-grounded in the classical Hatha source.
For the source text see the Wikipedia entry on Trataka and chapter 2 of the Hatha Yoga Pradipika.
