10/31/2023
3 lies you’ve been told about
1. Everyone’s eyes are brown
True, the melanin in everyone’s eyes is brown. But people have differing amounts of melanin in their irises, and this results in more or less light getting absorbed by or traveling through the iris making the eyes look hazel, green, blue, or brown. The less melanin in the iris, the lighter colored the eyes look.
2. Eye color can change over time
Yes and no. 90% of eye color changes occur in infancy before 6 months old, but the eyes can continue to get darker or lighter until age 6. After that, eye color is generally fixed but different outfit colors can “bring out the color” of your eyes. This is an optical illusion and not a true iris color change, so it is not true that some people’s eye color change by day or by situational differences such as the weather or their outfits.
Notable exceptions are if there is a true iris color change in adulthood. This is called and is associated with eye diseases such as , , or (among others). So if you or someone you know is an adult showing documented iris color changes, make sure to schedule an eye exam asap!
3. That blue-eyed baby must not belong to those brown-eyed parents…
False. Eye color is actually a trait determined by up to 16 genes, hence the spectrum of iris colors. But generally, brown is dominant and blue eye color is recessive. So if two brown eyed parents each contain the hidden blue eye genes in their DNA then they can in fact have a biological blue-eyed baby!
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