Why did you get your particular eye colour?

Explore the genetic variants steering iris melanin — and your eye colour.

Blue, green, brown — the difference lies in how much melanin the iris produces. A single region at HERC2 controls OCA2 gene activity and explains most of the blue-to-brown spectrum, while dozens of other variants fine-tune the shade.

What the analysis shows

Eye colour is one of the most emotionally charged heritable traits — and one of the best mapped. Variants in and near the OCA2 and HERC2 genes steer how much melanin the iris gets. DNAHelper shows which eye-colour-associated variants your raw file carries. The result is an association — actual eye colour is shaped by many markers together. The analysis runs entirely locally.

HERC2/OCA2 — the master switch for eye colour

The HERC2/OCA2 region on chromosome 15 is the hub — one variant there acts as a master switch for melanin production in the iris. Additional markers near genes such as SLC24A4, TYR and IRF4 shift the shade between blue, green, grey and brown.

One of the strongest genetic signals there is

Eye colour is among the traits where genetic models perform best — well enough to be used in forensic genetics. But 'best' still means probabilities: intermediate colours like green and hazel are harder to pin than pure blue or brown.

Shades are probabilities, not answers

Infant eye colour can shift over the first years as melanin production ramps up. And inheritance is not simple dominance — two brown-eyed parents can have a blue-eyed child because several variants interact.

What the result means — and does not mean

The analysis builds on the trait eye colour measurement (strong evidence strength). Eye-colour associations are among the strongest that exist for visible traits — but intermediate shades remain probabilities, not answers.

Associations are statistical — they describe populations, not destinies. Read how we grade evidence in our method.

Privacy: your file never leaves the browser

You choose your raw file locally — it is parsed and analysed entirely in your browser and is not uploaded for the standard analysis. The only exception is the optional DNA Chat feature where you, after explicit consent, can share selected variants. Read the privacy policy · What happens to your DNA file?

Compatible raw files

Works with raw data exports from MyHeritage, 23andMe, AncestryDNA, FamilyTreeDNA (.txt, .csv, .zip). The download guides show exactly where to find your file with each provider — and the file formats are explained here.

See your eye-colour genetics