Sibai

What is ST2?

ST2, or Sibai, is a point on the Stomach channel on the cheek, in a small dip about a finger-width below the centre of the lower eye socket rim.

Its Chinese name is usually translated as "four whites", a reference to clear, bright eyes. It is one of the first points on the Stomach channel, which classical texts describe as running down the face from beside the eye.

In traditional practice ST2 is reached for with eye and face complaints: tired or red eyes, twitching eyelids, sinus pressure over the cheek, and one-sided facial pain or weakness. It is also one of the points massaged in the Chinese school "eye exercises" that generations of children have done between lessons.

Two things are worth saying once, at the start. Long traditional use is not evidence that a point works, and it is not evidence that a point is safe either. Both have to be checked separately, and for ST2 the safety question matters more than usual, because the point sits directly over a small opening in the cheekbone where a facial nerve comes to the surface, and it is close to the eye.

The honest verdict on the evidence: there is almost nothing that tests ST2 on its own. Human research that includes it does so inside a package, either a group of needled points in a facial palsy or facial pain trial, or a whole sequence of eye-exercise massage points. Those studies cannot tell you what this one point contributed, and the eye-exercise results are mixed and mostly short-term. So treat ST2 as a traditional, widely taught point with a plausible-feeling but unproven effect.

Everything described on this page is self-applied finger pressure. Gentle pressure on an intact cheek is low-risk for most people, and if it gives you a few minutes of relief from eye strain, that is a reasonable thing to use it for. It is not a substitute for an eye test, and it will not change a prescription or reverse an eye disease.

Where is ST2 and how do you find it?

ST2 sits in a small hollow in the cheekbone, about one thumb-width below the lower rim of the eye socket, in line with the centre of the pupil.

• Start by looking straight ahead. Keep your head level and your eyes facing forward, so the pupil gives you a reliable vertical line. Tilting your head moves the landmark.
• Find the bony rim under your eye. Run a fingertip along the lower edge of the eye socket. You will feel a firm ridge of bone just under the soft tissue of the lower lid.
• Drop below the ridge. Move down from that rim by roughly one thumb-width, about 1 to 1.5 cm, staying on the pupil line. This is the classical 1 cun measurement, taken as the width of your own thumb at the knuckle.
• Feel for the small dip. Press very gently and you should find a slight give in the bone, like a shallow pit. That dip is the opening the facial nerve comes through, and ST2 is named for it.
• Check with the tenderness test. The spot is often mildly tender or gives a faint zinging feeling. A sharp, electric pain shooting into the lip or nose means you are pressing too hard on the nerve, not that you have found it better.

Keep ST2 clear of its neighbours. ST1 (Chengqi) is higher, right on the rim of the socket below the eyeball, and is not a point for self-pressure. ST3 is lower again, below the cheekbone beside the nostril. If you are on soft cheek with no bony dip under it, you have gone too far down.

You have one ST2 on each side of the face. Most people find them easily with the index or middle fingertip of the matching hand. Nothing on this page involves anything but your own fingertip on unbroken skin.

How do you apply pressure to ST2?

1. Wash your hands first. You are working beside the eye, so clean hands and short nails matter more here than almost anywhere else on the body.
2. Take contact lenses out if they are irritating you. Pressing near the orbit with a lens already bothering your eye tends to make the eye feel worse, not better.
3. Settle the fingertip in the dip. Use the flat pad of your index or middle finger, not the tip of the nail, and rest it in the small hollow below the eye socket rim.
4. Press lightly. Aim for a gentle, steady pressure that feels like a mild dull ache at most. Pressure near the eye should be far lighter than you would use on a shoulder or a hand.
5. Hold or circle for 30 to 60 seconds. Either hold steady pressure, or make slow small circles that move the skin over the bone rather than dragging across it.
6. Do both sides. Work them one at a time or together with both hands, whichever is steadier.
7. Repeat two or three times a day. A short session during screen breaks is a sensible pattern. More is not better near the eye.
8. Finish by closing your eyes. Rest with the eyes shut for half a minute and let the lids relax before going back to a screen.

Stop immediately if you get a sharp or electric pain, numbness or tingling spreading to the lip or nostril, watering that will not settle, or any change in vision. Those are signs you are compressing the nerve or irritating the eye, and they are a reason to stop for the day rather than press harder.

Never press on the eyeball itself. If your finger is on something soft and mobile rather than bone with a thin layer of tissue over it, you are too high. Keep pressure off broken skin, spots, cold sores, rashes or any area that is bruised or swollen.

What is ST2 traditionally used for?

• Tired, strained eyes. The commonest modern use, and the reason ST2 appears in the Chinese school eye-exercise routine. School-based studies of that whole routine have reported small short-term improvements in eye fatigue and focusing effort, but they test a sequence of points and cannot show what ST2 alone did.
• Red or itchy eyes. Classical texts list ST2 for redness, itching and watering. There is no controlled human trial of acupressure at this point for any eye condition, so this remains tradition only.
• Twitching eyelid. Tradition treats ST2 as a local point for eyelid spasm. Most eyelid twitching settles on its own with sleep and less caffeine, which makes any apparent effect from pressing very hard to interpret.
• Facial pain on one side. ST2 is included in needling formulas for trigeminal neuralgia, a condition causing severe stabbing facial pain. Trials in that area use needles, several points at once, and are generally small and unblinded. Self-pressure on this spot has not been tested, and firm pressure over the nerve can trigger an attack in people who already have the condition.
• Facial weakness or droop. Acupuncture studies of Bell's palsy, a sudden one-sided facial weakness, often include ST2 in the point selection. Results are mixed and the point cannot be separated from the rest of the protocol. Sudden facial droop always needs urgent medical assessment first, because stroke looks similar.
• Sinus pressure over the cheek. ST2 sits over the maxillary sinus area, so it is a popular self-massage spot for cheek congestion. The comfort people report is plausible as local soft-tissue relief, but no trial supports it, and bacterial sinus infection needs proper treatment.

Across all of these, the pattern is the same: a long traditional record, wide teaching, and essentially no point-specific human evidence. Use ST2 as a comfort measure, not as treatment for an eye or nerve problem.

What might regular use of ST2 help prevent?

• Build-up of eye strain during screen work. The most defensible prevention claim is modest: a brief break in which you stop looking at the screen, close your eyes and press gently may keep strain from accumulating through a long day. Much of that benefit probably comes from the pause itself rather than the point.
• Short-term visual fatigue, with weak support. The Chinese school eye-exercise programme that includes ST2 has been studied in schoolchildren using cross-sectional surveys and some school-based trials. Reported effects on self-rated eye tiredness and focusing effort are small and short-lived, and the studies are unblinded and vulnerable to expectation.
• Short-sightedness: claimed, not supported. The eye exercises were introduced partly in the hope of slowing myopia in children. The research has not shown a convincing effect on how fast short-sightedness progresses. Do not use ST2 in place of an eye test, glasses, or treatments your optometrist recommends.
• Recurrence of facial pain or palsy: no evidence. Tradition sometimes frames ST2 as maintenance after facial nerve problems. Nothing in the human literature supports using it to prevent a relapse, and in trigeminal neuralgia pressure over this spot can set off pain rather than prevent it.

A fair summary: ST2 is a reasonable anchor for a habit of taking eye breaks, and that habit is sensible regardless of the point. Claims that regular pressing protects eyesight, prevents myopia or wards off facial nerve disease go well past the evidence.

If you want prevention that is actually backed for eyes, the boring answers work better: regular eye tests, good lighting, looking into the distance periodically, treating dry eye properly, and sunglasses outdoors. Press ST2 alongside those if you enjoy it, not instead of them.

Are there tips for using ST2 effectively?

• Use far less pressure than you think. ST2 sits over a nerve opening in thin bone near the eye. Light, steady contact is the right dose here, and leaning in hard is more likely to cause a jolt of nerve pain than any benefit.
• Keep nails short and filed. A nail edge beside the eye can scratch the skin or, worse, flick into the eye itself. Use the flat pad of the finger every time.
• Warm your hands first. Cold fingertips on the face make people flinch and tense, which defeats the point of a relaxation break.
• Anchor it to screen breaks. Pair it with the habit of looking 6 metres away for 20 seconds every 20 minutes. The distance focusing has a clearer rationale for eye comfort than the pressure does.
• Work both sides evenly. Facial points are usually used in pairs. Doing one side only tends to leave the face feeling lopsided rather than achieving anything targeted.
• Move the skin, not across it. Small circles that glide the skin over the cheekbone are kinder than rubbing back and forth, which drags thin facial skin and can leave it red.
• Skip it if your skin is broken out there. Pressing over active acne, a cold sore or a rash spreads bacteria and irritates the skin. Wait until it clears.
• Give it a fair, limited trial. Try it for a week or two and notice honestly whether your eyes feel less tired. If nothing changes, there is no reason to keep doing it, and nothing is lost.
• Treat the real cause too. Dry air, an out-of-date glasses prescription, poor lighting and too little sleep cause most tired eyes. Pressure on ST2 does nothing about any of them.

What do people get wrong with ST2?

• Pressing on the eyeball. The commonest and most dangerous error. If the surface under your finger is soft and moves, you are on the eye or lower lid, not on ST2. Move down until you feel firm bone with a small dip in it.
• Grinding into the nerve. ST2 lies over the opening where a facial nerve emerges. Heavy pressure produces a sharp, electric feeling in the cheek, lip or nostril, and sometimes numbness afterwards. That is nerve irritation, not a sign the point has been activated.
• Confusing it with ST1 or ST3. ST1 sits right on the socket rim against the eyeball and is not a self-pressure point. ST3 is lower, below the cheekbone near the nostril. ST2 is the dip about a thumb-width below the socket rim on the pupil line.
• Expecting a cure. No amount of pressure here will reverse short-sightedness, clear cataracts, cure glaucoma or fix a facial nerve injury. Expecting that leads people to delay an eye test or a neurology appointment, which is the real harm.
• Using it with dirty hands or on a lens. Rubbing near the eye with unwashed fingers is a straightforward route to conjunctivitis. Pressing around an already irritating contact lens makes matters worse.
• Using nails or a hard tool. Pointed massage tools and fingernails do not belong beside the eye. Fingertip only.
• Ignoring a sudden facial droop. People sometimes press ST2 for hours when one side of the face stops moving. Sudden weakness, drooping or slurred speech needs emergency assessment that day, because stroke is on the list.
• Overdoing it. Several minutes at a time, many times a day, leaves the area sore and the skin red. Half a minute to a minute, two or three times daily, is plenty.

What does the research on ST2 actually say?

There is no published human trial that tests finger pressure on ST2 by itself for any condition. That is the key fact, and it puts a hard limit on what anyone can honestly claim for this point.

The closest body of research is on the Chinese school "eye exercises", a routine of self-massage at several points around the eye, ST2 among them, performed by schoolchildren between lessons. This has been examined in large cross-sectional surveys and in school-based studies in China. The general picture is small, short-term improvements in self-reported eye tiredness and in measures of focusing effort, alongside no convincing effect on how fast short-sightedness progresses. The studies are unblinded, the children know what they are doing, and compliance and technique vary widely. Those limitations fit all the results comfortably inside a placebo-sized effect.

ST2 also appears inside needling protocols in trials of facial conditions, particularly Bell's palsy, a sudden one-sided facial weakness, and trigeminal neuralgia, a severe stabbing facial pain. Those trials needle a group of points together, are usually small, and often compare against usual care rather than a convincing sham. Even where a trial reports benefit, there is no way to work out what ST2 contributed, and the intervention tested was needling by a practitioner, not self-applied pressure.

No systematic review has isolated this point. No dose-response work exists for pressure duration or force at ST2. Nobody has run a trial of ST2 acupressure for eye strain, dry eye, eyelid twitching or sinus discomfort, which are the uses people most often look it up for.

What that means for a reader: ST2 is a well-established traditional point with essentially no point-specific human evidence behind it. Gentle, short self-pressure on intact skin is low-risk for most people, and if it helps you take a break from a screen, that is a real if unglamorous benefit. Judge it on how you feel over a couple of weeks, and keep seeing an optometrist or doctor for anything to do with vision.