Genetically, partial heterochromia can happen at birth or as the melanin in the iris develops throughout childhood. Partial heterochromia can happen genetically, because of an underlying condition or due to the use of certain medication.
No two eye colors with partial heterochromia are exactly the same, and variations can occur in different angles, shapes and sizes. Blue eyes with a brown spot, blue eyes with gold flecks and brown eyes with gold flecks are common examples of the condition. Partial heterochromia occurs when one part of the iris is a different color than the majority. You may be familiar with the looks of complete heterochromia, in which each iris is a different color - or central heterochromia, where the inner ring and outer ring of the iris are different colors. What does partial heterochromia look like? So what makes partial heterochromia different from complete heterochromia and central heterochromia, what causes it and is it treatable? Let’s dive in. All types of heterochromia appear as either a two-toned eye(s) or two different colored eyes, with a variation of typical colors found in eyes: blue, brown, green, gold, etc. Heterochromia can occur based on the amount of melanin (less melanin = lighter color, more melanin = darker color) contained in the iris - the part of the eye that gives it color. Partial heterochromia, wherein the eye has a spot of color other than the primary eye color, can occur in one or both eyes and, like the other two varieties, does not affect visual acuity. Partial heterochromia, also called sectoral heterochromia, is one of three types of heterochromia (the other two being complete and central heterochromia).
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