What Are Sanpaku Eyes?

Causes, Prevention, and Treatment

Sanpaku eyes describe an eye appearance where white sclera is visible on three sides of the iris. The phrase comes from the Japanese idea of three whites. In clinical writing, the same visible-white pattern is usually discussed as scleral show, especially when the sclera appears above or below the iris rather than only at the inner and outer corners.

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

The term is often used online as a beauty or personality label. Medically, it is better treated as an eyelid, eye-position, or midface-structure observation. It does not diagnose a person’s health, temperament, or behaviour by itself.

Types of Sanpaku Eyes

Popular writing usually separates sanpaku eyes into two visual patterns. These labels are cultural descriptors, not medical diagnoses.

Traditional descriptions often attached character or health meanings to the two patterns. Those interpretations explain why the term became culturally loaded, but they should not be read as evidence that eye shape predicts behaviour or illness.

Upper sanpaku

Upper sanpaku means the sclera is visible above the iris in a relaxed forward gaze. Clinically, visible upper sclera can overlap with upper eyelid retraction, eye prominence, or gaze position.

In the older symbolic reading, upper sanpaku was sometimes described as “yang sanpaku” and associated with outward tension, aggression, or mental imbalance. The article keeps that context because readers often encounter the term through this folklore, but it is not a clinical finding.

Lower sanpaku

Lower sanpaku means the sclera is visible 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 linked with physical depletion or imbalance. Modern facial analysis would instead ask whether the visible lower sclera comes from eyelid position, eye prominence, gaze, or midface support.

In Western Medicine

In a relaxed forward gaze, the eyelids usually cover most of the vertical sclera above and below the iris. When a visible strip appears above or below the iris, clinicians describe it as 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 small amount of lower scleral show can make the eyes read as larger or more distinctive. More obvious exposure can make the eyes look tired, startled, or less supported by the lower lid and midface.

The aesthetic effect depends on the rest of the face: eyelid tone, canthal tilt, eye prominence, midface projection, and facial expression all change how the same amount of visible sclera is perceived. That is why sanpaku eyes should be assessed as part of the whole periocular region rather than as an isolated trait.

This is why sanpaku eyes can read in more than one way aesthetically. In some faces, the extra scleral visibility gives the eye area a memorable or slightly detached look that becomes part of the person’s recognisable appearance. In other faces, the same pattern can make the lower eyelid look unsupported or the expression look unintentionally tired.

What Causes Sanpaku Eyes?

Several different features can create the appearance of sanpaku eyes or lower scleral show. The important first step is separating a true eyelid-position finding 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 appearance is new, one-sided, changing, or paired with irritation, dryness, pain, bulging, or vision changes, it should be assessed by an eye-care clinician before any cosmetic treatment is considered.

• 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 post-surgical complications. A surgeon should evaluate eyelid tone, eye position, midface support, tear film, and medical risk before recommending a procedure.