What Are Sanpaku Eyes?

Sanpaku eyes are eyes where you can see white sclera on three sides of the iris. The name comes from the Japanese idea of three whites. In clinical writing the same pattern usually goes by scleral show, especially when the white sits above or below the iris rather than only at the inner and outer corners.

In older East Asian and macrobiotic readings, sanpaku was also treated as a symbolic sign: the white around the iris was said to reflect imbalance between body, mind, and spirit. That belief is part of the term's cultural history, not a modern diagnostic rule (Watson).

Online the term gets used as a beauty or personality label. Medically it is better treated as an observation about the eyelid, the eye's position, or the structure of the midface. On its own it tells you nothing about a person's health, temperament, or behavior.

Types of sanpaku eyes

Popular writing usually splits sanpaku eyes into two visual patterns. These are cultural descriptions, not medical diagnoses.

Older descriptions often tied character or health meanings to the two patterns. That is part of why the term carries so much baggage, but it is not evidence that eye shape predicts how someone behaves or whether they are ill.

Upper sanpaku

Upper sanpaku means the sclera shows above the iris when the eye is relaxed and looking forward. Clinically, visible upper sclera can overlap with upper eyelid retraction, a prominent eye, or simply where the person is looking.

In the older symbolic reading, upper sanpaku was sometimes called yang sanpaku and linked with outward tension, aggression, or mental imbalance. We mention it because that is how a lot of people first meet the term, but it is not a clinical finding.

Lower sanpaku

Lower sanpaku means the sclera shows beneath the iris. This is the pattern most people mean when they talk about sanpaku eyes online, and it overlaps with lower scleral show in facial analysis.

Lower sanpaku, or yin sanpaku, was traditionally tied to physical depletion or imbalance. Modern facial analysis would instead ask whether the visible lower sclera comes from eyelid position, a prominent eye, gaze, or weak midface support.

In Western medicine

In a relaxed forward gaze, the eyelids usually cover most of the sclera above and below the iris. When a visible strip appears in either spot, clinicians call it upper or lower scleral show. Loeb's aesthetic surgery review treats scleral show as a clinical eyelid-position finding rather than a personality sign (Loeb, 1988).

How do sanpaku eyes affect facial aesthetics?

Sanpaku eyes change how open the eye area looks. A little lower scleral show can make the eyes read as larger or more distinctive. More of it can make them look tired or startled, as if the lower lid and midface are not quite holding them up.

The effect depends on the rest of the face. Eyelid tone, canthal tilt, how prominent the eye is, midface projection, even expression all change how the same amount of visible sclera reads. That is why sanpaku eyes are best assessed as part of the whole eye area rather than as one isolated trait.

So the same pattern can land more than one way. On some faces, the extra scleral visibility gives the eyes a memorable, slightly detached look that becomes part of how the person is recognized. On others, it makes the lower lid look unsupported or the expression look tired when the person is not.

What causes sanpaku eyes?

Several different features can create the look of sanpaku eyes or lower scleral show. The first step is telling a true eyelid-position finding apart from a temporary gaze or head-position effect.

• Head position or upward gaze, which can create a false scleral show during photos or examination.
• Lower eyelid laxity, retraction, or ectropion, where the lid sits lower than expected against the eye.
• Eye prominence or exophthalmos, including medical causes that need eye or endocrine evaluation.
• Midface hypoplasia or weak lower orbital support, which can leave the lower eyelid looking less supported.
• Previous trauma or eyelid surgery, including blepharoplasty complications that pull the lower lid down.
• Congenital craniofacial or eyelid anatomy.

Clinical facial-analysis texts note that true scleral show can come from local eyelid problems, eye prominence, previous trauma or surgery, or broader midface structure. Tenzel also described scleral show as one possible complication after blepharoplasty (Tenzel, 1981).

How are sanpaku eyes treated?

Treatment depends on the cause. If the look is new, one-sided, changing, or comes with irritation, dryness, pain, bulging, or vision changes, see an eye doctor before considering any cosmetic treatment.

• Observation, if the appearance is mild, stable, and not causing irritation.
• Medical assessment for thyroid eye disease, eye prominence, lid retraction, trauma, or other eye conditions when symptoms or asymmetry are present.
• Midface or tear-trough filler in carefully selected cases where volume support is the main issue.
• Lower eyelid or canthal surgery when lid laxity, retraction, or ectropion is the driver.

Hyaluronic acid fillers

Hyaluronic acid filler can sometimes improve lower scleral show by adding support around the lower eyelid and midface. Bravo and colleagues describe the technique as a selected-use approach, not a universal fix (Bravo et al., 2018).

Surgery

Surgery is reserved for structural eyelid problems, significant retraction, ectropion, or complications from a previous operation. A surgeon should check eyelid tone, eye position, midface support, the tear film, and medical risk before recommending a procedure.