Predict your baby likely eye shape including almond, round, hooded, monolid, upturned, and downturned based on parental eye shapes and craniofacial genetics.
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Generated at traitgen.com. Free genetics education. Not medical advice.
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⚠️ Educational only. Probability estimates based on genetic models, not medical advice.
The almond eye shape is considered ancestrally ancient. Genetic modelling suggests it predates the divergence of major human population groups and appears across virtually every ethnic background on Earth.
Eye shape is determined by orbital bone structure, eyelid skin fold, and lid crease position. These are polygenic traits influenced by genes including PAX6, FOXL2, and the FGFR pathway involved in craniofacial development.
Almond-shaped eyes result from a specific orbital rim shape and lid positioning. Round eyes have a more pronounced curvature of the lid margin. Neither has a single dominant gene; the shape reflects an intermediate polygenic outcome in most mixed-parentage children.
Hooded eyes occur when excess brow skin folds over the lid crease. Monolid eyes, common in East Asian ancestry, lack a visible lid crease due to a smaller supratarsal fold. Both show strong familial inheritance with monolid being dominant within East Asian families.
The canthal angle (tilt of the outer eye corner) determines whether eyes appear upturned or downturned. This is largely governed by zygomatic bone shape and is a heritable craniofacial feature influenced by multiple genes.
Eye shape clusters strongly with ancestry. EDAR gene variants common in East Asian populations influence multiple facial features including eye shape. Epicanthal folds are influenced by fat pad distribution and orbital anatomy, both with strong genetic components.
Almond-shaped eyes are the most common eye shape globally, found across all ethnic groups. They are characterised by a visible crease, a slightly pointed inner corner, and an outer corner that tapers. Round eyes are second most common, followed by hooded eyes, which become more prevalent with age.
Yes. Because eye shape is polygenic, parents who both have almond eyes may carry recessive variants associated with rounder orbital anatomy. If those variants are inherited together, a child can express a different eye shape. This is more apparent when grandparents have noticeably different eye shapes.
Yes. Hooding of the upper eyelid increases as skin loses elasticity after age 40. The brow also descends with age, creating the appearance of more hooded or downturned eyes in people who had almond or round eyes in youth.
There is no single dominant eye shape gene. Eye shape involves multiple genes affecting orbital bone structure, fat pad distribution, and skin fold geometry. Children of parents with different eye shapes most commonly show an intermediate outcome.