Japanese eyes: iris color, shape and epicanthic fold in 43 observed portraits

Japanese: iris color Very dark brown / black-appearing in 100% of 11; eye shape Almond in 63% of 43; upper eyelid crease type Single eyelid (monolid, no crease) in 95% of 39; epicanthic fold Tarsalis in 100% of 39; palpebral fissure slant Slight upslant in 91% of 43; eyebrow shape Straight in 62% of 42.

Catalog portraits for Japanese are AI-generated adult subjects; the measurements on this page come from documented photographs of real people, not from these images.

Iris color

n = 11 assessable · 32 not assessable

Predominant color of the iris. Heterochromia is captured as its own value; mixed colors (e.g. hazel, blue-green) get distinct buckets.

Value	Share	n
Very dark brown / black-appearingIris appears nearly black under typical lighting; high melanin content. Common in East Asian, South Asian, Sub-Saharan African, and indigenous populations.	100%	11

Vocabulary: Iris color (iris_color_qualitative)

Eye shape

n = 43 assessable

Overall shape of the visible eye, considering the silhouette of the upper and lower lid margins together. Independent dimension from eyelid_crease_type and epicanthic_fold, which capture finer morphological variation.

Value	Share	n
AlmondSlightly elongated horizontal axis; mild taper at lateral and medial canthi. Considered the aesthetic reference shape.	63%	27
HoodedUpper lid skin descends over the lid crease, partially or fully covering the upper lid platform. Often associated with periorbital aging but can be constitutional.	21%	9
Monolid (no visible crease)Smooth upper lid with no visible supratarsal crease. Common in East Asian populations; associated with single eyelid morphology.	14%	6
DownturnedLateral canthus sits below the medial canthus; outer corner droops downward.	2%	1

Vocabulary: Eye shape (eye_shape_qualitative)

Upper eyelid crease type

n = 39 assessable

Morphology of the upper eyelid supratarsal crease. The single most ethnically-variant periocular dimension. The Asian-ophthalmology / Asian-blepharoplasty literature provides the canonical classification system, distinguishing several functional and aesthetic patterns.

Value	Share	n
Single eyelid (monolid, no crease)No visible supratarsal crease; smooth upper lid skin. Approximately 50% of East Asian populations.	95%	37
Double, low (~3-5mm above lash line)Crease present but sits low on the lid, close to the lash line. Common in East Asian populations with double lids.	5%	2

Vocabulary: Upper eyelid crease type (mccurdy_chen_eyelid_crease)

Epicanthic fold

n = 39 assessable

Presence and morphology of the epicanthic fold — the skin fold of the upper eyelid that may cover the medial canthus. Significant ethnic variation; high prevalence in East Asian, Central Asian, and indigenous American populations.

Value	Share	n
TarsalisFold begins at the upper lid skin and inserts on the lower lid, covering the medial canthus. The most common epicanthic-fold variant in East Asian populations.	100%	39

Vocabulary: Epicanthic fold (duke_elder_epicanthus_classification)

Palpebral fissure slant

n = 43 assessable

Angle of the palpebral fissure axis (line from medial to lateral canthus) relative to horizontal. Significant ethnic variation; East Asian populations average steeper upslant than European populations.

Value	Share	n
Slight upslantLateral canthus slightly higher than medial; ~5-10° above horizontal. Within the European aesthetic reference range.	91%	39
Slight downslantLateral canthus slightly below medial; visible fatigue or aging appearance.	9%	4

Vocabulary: Palpebral fissure slant (fissure_axis_qualitative)

Eyebrow shape

n = 42 assessable

Overall arch and shape of the eyebrow as visible in the photograph.

Value	Share	n
StraightMinimal arch; nearly horizontal brow line.	62%	26
Soft archGentle, gradual arch; arch peak in the lateral two-thirds.	29%	12
Flat / descendingNo arch; brow descends laterally toward the temple.	10%	4

Vocabulary: Eyebrow shape (eyebrow_shape_qualitative)

Where these numbers come from

43 publicly documented portraits of notable Japanese people were assessed by a vision model against the full 22-vocabulary schema, one value per dimension. Values are what the photographs show, read by a model, not population measurements. Each table counts only portraits where the value could be assessed; covered, obscured and unclear portraits are reported separately.

Notable-people corpora skew older, so hair color over-represents gray and white, and image quality varies. Treat shares as a description of this sample.

These rows are not yet in the published catalog dataset, which currently carries the earlier single-row analysis; see the methodology. A family page exists only when at least 10 portraits carry an assessable value.